Classics in the History of Psychology

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I shall begin by giving a short account of the views of earlier writers on this subject, and of the status of the dream-problem in contemporary science; since in the course of this treatise I shall not often have occasion to refer to either. In spite of thousands of years of endeavour, little progress has been made in the scientific understanding of dreams. This fact has been so universally acknowledged by previous writers on the subject that it seems hardly necessary to quote individual opinions. The reader will find, in the works listed at the end of this work, many stimulating observations, and plenty of interesting material relating to our subject, but little or nothing that concerns the true nature of the dream, or that solves definitely any of its enigmas. The educated layman, of course, knows even less of the matter.

The conception of the dream that was held in prehistoric ages by primitive peoples, and the influence which it may have exerted on the formation of their conceptions of the universe, and of the soul, is a theme of such great interest that it is only with reluctance that I refrain from dealing with it in these pages. I will refer the reader to the well-known works of Sir John Lubbock (Lord Avebury), Herbert Spencer, E. B. Tylor, and other writers; I will only add that we shall not realize the importance of these problems and speculations until we have completed the task of dream- interpretation that lies before us.

A reminiscence of the concept of the dream that was held in primitive times seems to underlie the evaluation of the dream which was current among the peoples of classical antiquity.[1] They took it for granted that dreams were related to the world of the supernatural beings in whom they believed, and that they brought inspirations from the gods and demons. Moreover, it appeared to them that dreams must serve a special purpose in respect of the dreamer; that, as a rule, they predicted the future. The extraordinary variations in the content of dreams, and in the impressions which they produced on the dreamer, made it, of course, very difficult to formulate a coherent conception of them, and necessitated manifold differentiations and group-formations, according to their value and reliability. The valuation of dreams by the individual philosophers of antiquity naturally depended on the importance which they were prepared to attribute to manticism in general.

In the two works of Aristotle in which there is mention of dreams, they are already regarded as constituting a problem of psychology. We are told that the dream is not god-sent, that it is not of divine but of demonic origin. For nature is really demonic, not divine; that is to say, the dream is not a supernatural revelation, but is subject to the laws of the human spirit, which has, of course, a kinship with the divine. The dream is defined as the psychic activity of the sleeper, inasmuch as he is asleep. Aristotle was acquainted with some of the characteristics of the dream-life; for example, he knew that a dream converts the slight sensations perceived in sleep into intense sensations ("one imagines that one is walking through fire, and feels hot, if this or that part of the body becomes only quite slightly warm"), which led him to conclude that dreams might easily betray to the physician the first indications of an incipient physical change which escaped observation during the day.[2]

As has been said, those writers of antiquity who preceded Aristotle did not regard the dream as a product of the dreaming psyche, but as an inspiration of divine origin, and in ancient times the two opposing tendencies which we shall find throughout the ages in respect of the evaluation of the dream- life were already perceptible. The ancients distinguished between the true and valuable dreams which were sent to the dreamer as warnings, or to foretell future events, and the vain, fraudulent, and empty dreams whose object was to misguide him or lead him to destruction.

Gruppe[3] speaks of such a classification of dreams, citing Macrobius and Artemidorus: "Dreams were divided into two classes; the first class was believed to be influenced only by the present (or the past), and was unimportant in respect of the future; it included the enuknia (insomnia), which directly reproduce a given idea or its opposite; e.g., hunger or its satiation; and the phantasmata, which elaborate the given idea phantastically, as e.g. the nightmare, ephialtes. The second class of dreams, on the other hand, was determinative of the future. To this belonged:

1. Direct prophecies received in the dream (chrematismos, oraculum);

2. the foretelling of a future event (orama, visio);

3. the symbolic dream, which requires interpretation (oneiros, somnium.)

This theory survived for many centuries."

Connected with these varying estimations of the dream was the problem of "dream-interpretation." Dreams in general were expected to yield important solutions, but not every dream was immediately understood, and it was impossible to be sure that a certain incomprehensible dream did not really foretell something of importance, so that an effort was made to replace the incomprehensible content of the dream by something that should be at once comprehensible and significant. In later antiquity Artemidorus of Daldis was regarded as the greatest authority on dream-interpretation. His comprehensive works must serve to compensate us for the lost works of a similar nature[4] The pre-scientific conception of the dream which obtained among the ancients was, of course, in perfect keeping with their general conception of the universe, which was accustomed to project as an external reality that which possessed reality only in the life of the psyche. Further, it accounted for the main impression made upon the waking life by the morning memory of the dream; for in this memory the dream, as compared with the rest of the psychic content, seems to be something alien, coming, as it were, from another world. It would be an error to suppose that theory of the supernatural origin of dreams lacks followers even in our own times; for quite apart from pietistic and mystical writers- who cling, as they are perfectly justified in doing, to the remnants of the once predominant realm of the supernatural until these remnants have been swept away by scientific explanation- we not infrequently find that quite intelligent persons, who in other respects are averse from anything of a romantic nature, go so far as to base their religious belief in the existence and co-operation of superhuman spiritual powers on the inexplicable nature of the phenomena of dreams (Haffner). The validity ascribed to the dream-life by certain schools of philosophy- for example, by the school of Schelling- is a distinct reminiscence of the undisputed belief in the divinity of dreams which prevailed in antiquity; and for some thinkers the mantic or prophetic power of dreams is still a subject of debate. This is due to the fact that the explanations attempted by psychology are too inadequate to cope with the accumulated material, however strongly the scientific thinker may feel that such superstitious doctrines should be repudiated.

To write strongly the history of our scientific knowledge of the dream- problem is extremely difficult, because, valuable though this knowledge may be in certain respects, no real progress in a definite direction is as yet discernible. No real foundation of verified results has hitherto been established on which future investigators might continue to build. Every new author approaches the same problems afresh, and from the very beginning. If I were to enumerate such authors in chronological order, giving a survey of the opinions which each has held concerning the problems of the dream, I should be quite unable to draw a clear and complete picture of the present state of our knowledge on the subject. I have therefore preferred to base my method of treatment on themes rather than on authors, and in attempting the solution of each problem of the dream I shall cite the material found in the literature of the subject.

But as I have not succeeded in mastering the whole of this literature- for it is widely dispersed, and interwoven with the literature of other subjects- I must ask my readers to rest content with my survey as it stands, provided that no fundamental fact or important point of view has been overlooked.

Until recently most authors have been inclined to deal with the subjects of sleep and dreams in conjunction, and together with these they have commonly dealt with analogous conditions of a psycho-pathological nature, and other dream-like phenomena, such as hallucinations, visions, etc. In recent works, on the other hand, there has been a tendency to keep more closely to the theme, and to consider, as a special subject, the separate problems of the dream-life. In this change I should like to perceive an expression of the growing conviction that enlightenment and agreement in such obscure matters may be attained only by a series of detailed investigations. Such a detailed investigation, and one of a special psychological nature, is expounded in these pages. I have had little occasion to concern myself with the problem of sleep, as this is essentially a physiological problem, although the changes in the functional determination of the psychic apparatus should be included in a description of the sleeping state. The literature of sleep will therefore not be considered here.

A scientific interest in the phenomena of dreams as such leads us to propound the following problems, which to a certain extent, interdependent, merge into one another.

A. The Relation of the Dream to the Waking State

The naive judgment of the dreamer on waking assumes that the dream- even if it does not come from another world- has at all events transported the dreamer into another world. The old physiologist, Burdach, to whom we are indebted for a careful and discriminating description of the phenomena of dreams, expressed this conviction in a frequently quoted passage (p. 474): "The waking life, with its trials and joys, its pleasures and pains, is never repeated; on the contrary, the dream aims at relieving us of these. Even when our whole mind is filled with one subject, when our hearts are rent by bitter grief, or when some task has been taxing our mental capacity to the utmost, the dream either gives us something entirely alien, or it selects for its combinations only a few elements of reality; or it merely enters into the key of our mood, and symbolizes reality." J. H. Fichte (I. 541) speaks in precisely the same sense of supplementary dreams, calling them one of the secret, self-healing benefits of the psyche. L. Strumpell expresses himself to the same effect in his Natur und Entstehung der Traume, a study which is deservedly held in high esteem. "He who dreams turns his back upon the world of waking consciousness" (p. 16); "In the dream the memory of the orderly content of waking consciousness and its normal behaviour is almost entirely lost" (p. 17); "The almost complete and unencumbered isolation of the psyche in the dream from the regular normal content and course of the waking state..." (p. 19).

Yet the overwhelming majority of writers on the subject have adopted the contrary view of the relation of the dream to waking life. Thus Haffner (p. 19): "To begin with, the dream continues the waking life. Our dreams always connect themselves with such ideas as have shortly before been present in our consciousness. Careful examination will nearly always detect a thread by which the dream has linked itself to the experiences of the previous day." Weygandt (p. 6) flatly contradicts the statement of Burdach. "For it may often be observed, apparently indeed in the great majority of dreams, that they lead us directly back into everyday life, instead of releasing us from it." Maury (p. 56) expresses the same idea in a concise formula: "Nous revons de ce que nous avons vu, dit, desire, ou fait."[5] Jessen, in his Psychologie, published in 1855 (p. 530), is rather more explicit: "The content of dreams is always more or less determined by the personality, the age, sex, station in life, education and habits, and by the events and experiences of the whole past life of the individual."

The philosopher, I. G. E. Maas, adopts the most unequivocal attitude in respect of this question (Uber die Leidenschaften, 1805): "Experience corroborates our assertion that we dream most frequently of those things toward which our warmest passions are directed. This shows us that our passions must influence the generation of our dreams. The ambitious man dreams of the laurels which he has won (perhaps only in imagination), or has still to win, while the lover occupies himself, in his dreams, with the object of his dearest hopes.... All the sensual desires and loathings which slumber in the heart, if they are stimulated by any cause, may combine with other ideas and give rise to a dream; or these ideas may mingle in an already existing dream."[6]

The ancients entertained the same idea concerning the dependence of the dream-content on life. I will quote Radestock (p. 139): "When Xerxes, before his expedition against Greece, was dissuaded from his resolution by good counsel, but was again and again incited by dreams to undertake it, one of the old, rational dream-interpreters of the Persians, Artabanus, told him, and very appropriately, that dream-images for the most part contain that of which one has been thinking in the waking state."

In the didactic poem of Lucretius, On the Nature of Things (IV. 962), there occurs this passage:

"Et quo quisque fere studio devinctus adhaeret, aut quibus in rebus multum sumus ante morati atque in ea ratione fuit contenta magis mens, in somnis eadem plerumque videmur obire; causidici causas agere et componere leges, induperatores pugnare ac proelia obire,"... etc., etc.[7] Cicero (De Divinatione, II. LXVII) says, in a similar strain, as does also Maury many centuries later: "Maximeque 'reliquiae' rerum earum moventur in animis et agitantur, de quibus vigilantes aut cogitavimus aut egimus."[8]

The contradiction between these two views concerning the relation between dream life and waking life seems indeed irresolvable. Here we may usefully cite the opinion of F. W. Hildebrandt (1875), who held that on the whole the peculiarities of the dream can only be described as "a series of contrasts which apparently amount to contradictions" (p. 8). "The first of these contrasts is formed by the strict isolation or seclusion of the dream from true and actual life on the one hand, and on the other hand by the continuous encroachment of the one upon the other, and the constant dependence of the one upon the other. The dream is something absolutely divorced from the reality experienced during the waking state; one may call it an existence hermetically sealed up and insulated from real life by an unbridgeable chasm. It frees us from reality, blots out the normal recollection of reality, and sets us in another world and a totally different life, which fundamentally has nothing in common with real life...." Hildebrandt then asserts that in falling asleep our whole being, with its forms of existence, disappears "as through an invisible trapdoor." In one's dream one is perhaps making a voyage to St. Helena in order to offer the imprisoned Napoleon an exquisite vintage of Moselle. One is most affably received by the ex-emperor, and one feels almost sorry when, on waking, the interesting illusion is destroyed. But let us now compare the situation existing in the dream with the actual reality. The dreamer has never been a wine-merchant, and has no desire to become one. He has never made a sea-voyage, and St. Helena is the last place in the world that he would choose as the destination of such a voyage. The dreamer feels no sympathy for Napoleon, but on the contrary a strong patriotic aversion. And lastly, the dreamer was not yet among the living when Napoleon died on the island of St. Helena; so that it was beyond the realms of possibility that he should have had any personal relations with Napoleon. The dream- experience thus appears as something entirely foreign, interpolated between two mutually related and successive periods of time.

"Nevertheless," continues Hildebrandt, "the apparent contrary is just as true and correct. I believe that side by side with this seclusion and insulation there may still exist the most intimate interrelation. We may therefore justly say: Whatever the dream may offer us, it derives its material from reality, and from the psychic life centered upon this reality. However extraordinary the dream may seem, it can never detach itself from the real world, and its most sublime as well as its most ridiculous constructions must always borrow their elementary material either from that which our eyes have beheld in the outer world, or from that which has already found a place somewhere in our waking thoughts; in other words, it must be taken from that which we have already experienced, either objectively or subjectively."

B. The Material of Dreams- Memory in Dreams

That all the material composing the content of a dream is somehow derived from experience, that it is reproduced or remembered in the dream- this at least may be accepted as an incontestable fact. Yet it would be wrong to assume that such a connection between the dream-content and reality will be easily obvious from a comparison between the two. On the contrary, the connection must be carefully sought, and in quite a number of cases it may for a long while elude discovery. The reason for this is to be found in a number of peculiarities evinced by the faculty of memory in dreams; which peculiarities, though generally observed, have hitherto defied explanation. It will be worth our while to examine these characteristics exhaustively.

To begin with, it happens that certain material appears in the dream- content which cannot be subsequently recognized, in the waking state, as being part of one's knowledge and experience. One remembers clearly enough having dreamed of the thing in question, but one cannot recall the actual experience or the time of its occurrence. The dreamer is therefore in the dark as to the source which the dream has tapped, and is even tempted to believe in an independent productive activity on the part of the dream, until, often long afterwards, a fresh episode restores the memory of that former experience, which had been given up for lost, and so reveals the source of the dream. One is therefore forced to admit that in the dream something was known and remembered that cannot be remembered in the waking state.[9]

Delboeuf relates from his own experience an especially impressive example of this kind. He saw in his dream the courtyard of his house covered with snow, and found there two little lizards, half-frozen and buried in the snow. Being a lover of animals he picked them up, warmed them, and put them back into the hole in the wall which was reserved especially for them. He also gave them a few fronds of a little fern which was growing on the wall, and of which he knew they were very fond. In the dream he knew the name of the plant; Asplenium ruta muralis. The dream continued returning after a digression to the lizards, and to his astonishment Delboeuf saw two other little lizards falling upon what was left of the ferns. On turning his eyes to the open fields he saw a fifth and a sixth lizard making for the hole in the wall, and finally the whole road was covered by a procession of lizards, all wandering in the same direction.

In his waking state Delboeuf knew only a few Latin names of plants, and nothing of any Asplenium. To his great surprise he discovered that a fern of this name did actually exist, and that the correct name was Asplenium ruta muraria, which the dream had slightly distorted. An accidental coincidence was of course inconceivable; yet where he got his knowledge of the name Asplenium in the dream remained a mystery to him.

The dream occurred in 1862. Sixteen years later, while at the house of one of his friends, the philosopher noticed a small album containing dried plants, such as are sold as souvenirs to visitors in many parts of Switzerland. A sudden recollection came to him: he opened the herbarium, discovered therein the Asplenium of his dream, and recognized his own handwriting in the accompanying Latin name. The connection could now be traced. In 1860, two years before the date of the lizard dream, one of his friend's sisters, while on her wedding-journey, had paid a visit to Delboeuf. She had with her at the time this very album, which was intended for her brother, and Delboeuf had taken the trouble to write, at the dictation of a botanist, the Latin name under each of the dried plants.

The same good fortune which gave this example its unusual value enabled Delboeuf to trace yet another portion of this dream to its forgotten source. One day in 1877 he came upon an old volume of an illustrated periodical, in which he found the whole procession of lizards pictured, just as he had dreamt of it in 1862. The volume bore the date 1861, and Delboeuf remembered that he had subscribed to the journal since its first appearance.

That dreams have at their disposal recollections which are inaccessible to the waking state is such a remarkable and theoretically important fact that I should like to draw attention to the point by recording yet other hypermnesic dreams. Maury relates that for some time the word Mussidan used to occur to him during the day. He knew it to be the name of a French city, but that was all. One night he dreamed of a conversation with a certain person, who told him that she came from Mussidan, and, in answer to his question as to where the city was, she replied: "Mussidan is the principal town of a district in the department of Dordogne." On waking, Maury gave no credence to the information received in his dream; but the gazetteer showed it to be perfectly correct. In this case the superior knowledge of the dreamer was confirmed, but it was not possible to trace the forgotten source of this knowledge.

Jessen (p. 55) refers to a very similar incident, the period of which is more remote. "Among others we may here mention the dream of the elder Scaliger (Hennings, l.c., p. 300), who wrote a poem in praise of the famous men of Verona, and to whom a man named Brugnolus appeared in a dream, complaining that he had been neglected. Though Scaliger could not remember that he had heard of the man, he wrote some verses in his honour, and his son learned subsequently that a certain Brugnolus had at one time been famed in Verona as a critic."

A hypermnesic dream, especially remarkable for the fact that a memory not at first recalled was afterwards recognized in a dream which followed the first, is narrated by the Marquis d'Hervey de St. Denis:[10] "I once dreamed of a young woman with fair golden hair, whom I saw chatting with my sister as she showed her a piece of embroidery. In my dream she seemed familiar to me; I thought, indeed, that I had seen her repeatedly. After waking, her face was still quite vividly before me, but I was absolutely unable to recognize it. I fell asleep again; the dream-picture repeated itself. In this new dream I addressed the golden-haired lady and asked her whether I had not had the pleasure of meeting her somewhere. 'Of course,' she replied; 'don't you remember the bathing-place at Pornic?' Thereupon I awoke, and I was then able to recall with certainty and in detail the incidents with which this charming dream-face was connected."

The same author[11] recorded that a musician of his acquaintance once heard in a dream a melody which was absolutely new to him. Not until many years later did he find it in an old collection of musical compositions, though still he could not remember ever having seen it before.

I believe that Myers has published a whole collection of such hypermnesic dreams in the Proceedings of the Society for Psychical Research, but these, unfortunately, are inaccessible to me. I think everyone who occupies himself with dreams will recognize, as a very common phenomenon, the fact that a dream will give proof of the knowledge and recollection of matters of which the dreamer, in his waking state, did not imagine himself to be cognizant. In my analytic investigations of nervous patients, of which I shall speak later, I find that it happens many times every week that I am able to convince them, from their dreams, that they are perfectly well acquainted with quotations, obscene expressions, etc., and make use of them in their dreams, although they have forgotten them in their waking state. I shall here cite an innocent example of dream-hypermnesia, because it was easy to trace the source of the knowledge which was accessible only in the dream.

A patient dreamed amongst other things (in a rather long dream) that he ordered a kontuszowka in a cafe, and after telling me this he asked me what it could be, as he had never heard the name before. I was able to tell him that kontuszowka was a Polish liqueur, which he could not have invented in his dream, as the name had long been familiar to me from the advertisements. At first the patient would not believe me, but some days later, after he had allowed his dream of the cafe to become a reality, he noticed the name on a signboard at a street corner which for some months he had been passing at least twice a day.

I have learned from my own dreams how largely the discovery of the origin of individual dream-elements may be dependent on chance. Thus, for some years before I had thought of writing this book, I was haunted by the picture of a church tower of fairly simple construction, which I could not remember ever having seen. I then suddenly recognized it, with absolute certainty, at a small station between Salzburg and Reichenhall. This was in the late nineties, and the first time I had travelled over this route was in 1886. In later years, when I was already busily engaged in the study of dreams, I was quite annoyed by the frequent recurrence of the dream-image of a certain peculiar locality. I saw, in definite orientation to my own person- on my left- a dark space in which a number of grotesque sandstone figures stood out. A glimmering recollection, which I did not quite believe, told me that it was the entrance to a beer-cellar; but I could explain neither the meaning nor the origin of this dream-picture. In 1907 I happened to go to Padua, which, to my regret, I had been unable to visit since 1895. My first visit to this beautiful university city had been unsatisfactory. I had been unable to see Giotto's frescoes in the church of the Madonna dell' Arena: I set out for the church, but turned back on being informed that it was closed for the day. On my second visit, twelve years later, I thought I would compensate myself for this disappointment, and before doing anything else I set out for Madonna dell' Arena. In the street leading to it, on my left, probably at the spot where I had turned back in 1895, I discovered the place, with its sandstone figures, which I had so often seen in my dream. It was, in fact, the entrance to a restaurant garden.

One of the sources from which dreams draw material for reproduction- material of which some part is not recalled or utilized in our waking thoughts- is to be found in childhood. Here I will cite only a few of the authors who have observed and emphasized this fact:

Hildebrandt (p. 23): "It has already been expressly admitted that a dream sometimes brings back to the mind, with a wonderful power of reproduction, remote and even forgotten experiences from the earliest periods of one's life."

Strumpell (p. 40): "The subject becomes more interesting still when we remember how the dream sometimes drags out, as it were, from the deepest and densest psychic deposits which later years have piled upon the earliest experiences of childhood, the pictures of certain persons, places and things, quite intact, and in all their original freshness. This is confined not merely to such impressions as were vividly perceived at the time of their occurrence, or were associated with intense psychological values, to recur later in the dream as actual reminiscences which give pleasure to the waking mind. On the contrary, the depths of the dream-memory rather contain such images of persons, places, things and early experiences as either possessed but little consciousness and no psychic value whatsoever, or have long since lost both, and therefore appear totally strange and unknown, both in the dream and in the waking state, until their early origin is revealed."

Volkelt (p. 119): "It is especially to be remarked how readily infantile and youthful reminiscences enter into our dreams. What we have long ceased to think about, what has long since lost all importance for us, is constantly recalled by the dream."

The control which the dream exercises over material from our childhood, most of which, as is well known, falls into the lacunae of our conscious memory, is responsible for the production of interesting hypermnesic dreams, of which I shall cite a few more examples.

Maury relates (p. 92) that as a child he often went from his native city, Meaux, to the neighbouring Trilport, where his father was superintending the construction of a bridge. One night a dream transported him to Trilport and he was once more playing in the streets there. A man approached him, wearing a sort of uniform. Maury asked him his name, and he introduced himself, saying that his name was C, and that he was a bridge-guard. On waking, Maury, who still doubted the actuality of the reminiscence, asked his old servant, who had been with him in his childhood, whether she remembered a man of this name. "Of course," was the reply; "he used to be watchman on the bridge which your father was building then."

Maury records another example, which demonstrates no less clearly the reliability of the reminiscences of childhood that emerge in our dreams. M. F., who as a child had lived in Montbrison, decided, after an absence of twenty-five years, to visit his home and the old friends of his family. The night before his departure he dreamt that he had reached his destination, and that near Montbrison he met a man whom he did not know by sight, and who told him that he was M. F., a friend of his father's. The dreamer remembered that as a child he had known a gentleman of this name, but on waking he could no longer recall his features. Several days later, having actually arrived at Montbrison, he found once more the locality of his dream, which he had thought was unknown to him, and there he met a man whom he at once recognized as the M. F. of his dream, with only this difference, that the real person was very much older than his dream-image.

Here I might relate one of my own dreams, in which the recalled impression takes the form of an association. In my dream I saw a man whom I recognized, while dreaming, as the doctor of my native town. His face was not distinct, but his features were blended with those of one of my schoolmasters, whom I still meet from time to time. What association there was between the two persons I could not discover on waking, but upon questioning my mother concerning the doctor I learned that he was a one- eyed man. The schoolmaster, whose image in my dream obscured that of the physician, had also only one eye. I had not seen the doctor for thirty- eight years, and as far as I know I had never thought of him in my waking state, although a scar on my chin might have reminded me of his professional attentions.

As though to counterbalance the excessive part which is played in our dreams by the impressions of childhood, many authors assert that the majority of dreams reveal elements drawn from our most recent experiences. Robert (p. 46) even declares that the normal dream generally occupies itself only with the impressions of the last few days. We shall find, indeed, that the theory of the dream advanced by Robert absolutely requires that our oldest impressions should be thrust into the background, and our most recent ones brought to the fore. However, the fact here stated by Robert is correct; this I can confirm from my own investigations. Nelson, an American author, holds that the impressions received in a dream most frequently date from the second day before the dream, or from the third day before it, as though the impressions of the day immediately preceding the dream were not sufficiently weakened and remote.

Many authors who are unwilling to question the intimate connection between the dream-content and the waking state have been struck by the fact that the impressions which have intensely occupied the waking mind appear in dreams only after they have been to some extent removed from the mental activities of the day. Thus, as a rule, we do not dream of a beloved person who is dead while we are still overwhelmed with sorrow (Delage). Yet Miss Hallam, one of the most recent observers, has collected examples which reveal the very opposite behaviour in this respect, and upholds the claims of psychological individuality in this matter.

The third, most remarkable, and at the same time most incomprehensible, peculiarity of memory in dreams is shown in the selection of the material reproduced; for here it is not, as in the waking state, only the most significant things that are held to be worth remembering, but also the most indifferent and insignificant details. In this connection I will quote those authors who have expressed their surprise in the most emphatic language.

Hildebrandt (p. 11): "For it is a remarkable fact that dreams do not, as a rule, take their elements from important and far-reaching events, or from the intense and urgent interests of the preceding day, but from unimportant incidents, from the worthless odds and ends of recent experience or of the remoter past. The most shocking death in our family, the impressions of which keep us awake long into the night, is obliterated from our memories until the first moment of waking brings it back to us with distressing force. On the other hand, the wart on the forehead of a passing stranger, to whom we did not give a moment's thought once he was out of sight, finds a place in our dreams."

Strumpell (p. 39) speaks of "cases in which the analysis of a dream brings to light elements which, although derived from the experiences of yesterday or the day before yesterday, were yet so unimportant and worthless for the waking state that they were forgotten soon after they were experienced. Some experiences may be the chance-heard remarks of other persons, or their superficially observed actions, or, fleeting perceptions of things or persons, or isolated phrases that we have read, etc."

Havelock Ellis (p. 727): "The profound emotions of waking life, the questions and problems on which we spend our chief voluntary mental energy, are not those which usually present themselves at once to dream- consciousness. It is, so far as the immediate past is concerned, mostly the trifling, the incidental, the 'forgotten' impressions of daily life which reappear in our dreams. The psychic activities that are awake most intensely are those that sleep most profoundly."

It is precisely in connection with these characteristics of memory in dreams that Binz (p. 45) finds occasion to express dissatisfaction with the explanations of dreams which he himself had favoured: "And the normal dream raises similar questions. Why do we not always dream of mental impressions of the day before, instead of going back, without any perceptible reason, to the almost forgotten past, now lying far behind us? Why, in a dream, does consciousness so often revive the impression of indifferent memory- pictures, while the cerebral cells that bear the most sensitive records of experience remain for the most part inert and numb, unless an acute revival during the waking state has quite recently excited them?"

We can readily understand how the strange preference shown by the dream- memory for the indifferent and therefore disregarded details of daily experience must commonly lead us altogether to overlook the dependence of dreams on the waking state, or must at least make it difficult for us to prove this dependence in any individual case. Thus it happened that in the statistical treatment of her own and her friend's dream, Miss Whiton Calkins found that 11 per cent of the entire number showed no relation to the waking state. Hildebrandt was certainly correct in his assertion that all our dream-images could be genetically explained if we devoted enough time and material to the tracing of their origin. To be sure, he calls this "a most tedious and thankless job. For most often it would lead us to ferret out all sorts of psychically worthless things from the remotest corners of our storehouse of memories, and to bring to light all sorts of quite indifferent events of long ago from the oblivion which may have overtaken them an hour after their occurrence." I must, however, express my regret that this discerning author refrained from following the path which at first sight seemed so unpromising, for it would have led him directly to the central point of the explanation of dreams.

The behaviour of memory in dreams is surely most significant for any theory of memory whatsoever. It teaches us that "nothing which we have once psychically possessed is ever entirely lost" (Scholz, p. 34); or as Delboeuf puts it, "que toute impression, meme la plus insignificante, laisse une trace inalterable, indifiniment susceptible de reparaitre au jour";[12] a conclusion to which we are urged by so many other pathological manifestations of mental life. Let us bear in mind this extraordinary capacity of the memory in dreams, in order the more keenly to realize the contradiction which has to be put forward in certain dream-theories to be mentioned later, which seek to explain the absurdities and incoherences of dreams by a partial forgetting of what we have known during the day.

It might even occur to one to reduce the phenomenon of dreaming to that of remembering, and to regard the dream as the manifestation of a reproductive activity, unresting even at night, which is an end in itself. This would seem to be in agreement with statements such as those made by Pilcz, according to which definite relations between the time of dreaming and the contents of a dream may be demonstrated, inasmuch as the impressions reproduced by the dream in deep sleep belong to the remote past, while those reproduced towards morning are of recent origin. But such a conception is rendered improbable from the outset by the manner in which the dream deals with the material to be remembered. Strumpell rightly calls our attention to the fact that repetitions of experiences do not occur in dreams. It is true that a dream will make a beginning in that direction, but the next link is wanting; it appears in a different form, or is replaced by something entirely novel. The dream gives us only fragmentary reproductions; this is so far the rule that it permits of a theoretical generalization. Still, there are exceptions in which an episode is repeated in a dream as completely as it can be reproduced by our waking memory. Delboeuf relates of one of his university colleagues that a dream of his repeated, in all its details, a perilous drive in which he escaped accident as if by miracle. Miss Calkins mentions two dreams the contents of which exactly reproduced an experience of the previous day, and in a later chapter I shall have occasion to give an example that came to my knowledge of a childish experience which recurred unchanged in a dream.[13]

C. Dream-Stimuli and Sources

What is meant by dream-stimuli and dream-sources may be explained by a reference to the popular saying: "Dreams come from the stomach." This notion covers a theory which conceives the dream as resulting from a disturbance of sleep. We should not have dreamed if some disturbing element had not come into play during our sleep, and the dream is the reaction against this disturbance.

The discussion of the exciting causes of dreams occupies a great deal of space in the literature of dreams. It is obvious that this problem could have made its appearance only after dreams had become an object of biological investigation. The ancients, who conceived of dreams as divine inspirations, had no need to look for stimuli; for them a dream was due to the will of divine or demonic powers, and its content was the product of their special knowledge and intention. Science, however, immediately raised the question whether the stimuli of dreams were single or multiple, and this in turn led to the consideration whether the causal explanation of dreams belonged to the region of psychology or to that of physiology. Most authors appear to assume that disturbance of sleep, and hence dreams, may arise from various causes, and that physical as well as mental stimuli may play the part of dream-excitants. Opinions differ widely in preferring this or the other factor as the cause of dreams, and in classifying them in the order of importance.

Whenever the sources of dreams are completely enumerated they fall into the following four categories, which have also been employed in the classification of dreams: (1) external (objective) sensory stimuli; (2) internal (subjective) sensory stimuli; (3) internal (organic) physical stimuli; (4) Purely psychical sources of excitation.

1. External sensory stimuli

The younger Strumpell, the son of the philosopher, whose work on dreams has already more than once served us as a guide in considering the problems of dreams, has, as is well known, recorded his observations of a patient afflicted with general anaesthesia of the skin and with paralysis of several of the higher sensory organs. This man would laps into sleep whenever the few remaining sensory paths between himself and the outer world were closed. When we wish to fall asleep we are accustomed to strive for a condition similar to that obtaining in Strumpell's experiment. We close the most important sensory portals, the eyes, and we endeavour to protect the other senses from all stimuli or from any change of the stimuli already acting upon them. We then fall asleep, although our preparations are never wholly successful. For we can never completely insulate the sensory organs, nor can we entirely abolish the excitability of the sensory organs themselves. That we may at any time be awakened by intenser stimuli should prove to us "that the mind has remained in constant communication with the external world even during sleep." The sensory stimuli that reach us during sleep may easily become the source of dreams.

There are a great many stimuli of this nature, ranging from those unavoidable stimuli which are proper to the state of sleep or occasionally admitted by it, to those fortuitous stimuli which are calculated to wake the sleeper. Thus a strong light may fall upon the eyes, a noise may be heard, or an odour may irritate the mucous membranes of the nose. In our unintentional movements during sleep we may lay bare parts of the body, and thus expose them to a sensation of cold, or by a change of position we may excite sensations of pressure and touch. A mosquito may bite us, or a slight nocturnal mischance may simultaneously attack more than one sense- organ. Observers have called attention to a whole series of dreams in which the stimulus ascertained on waking and some part of the dream-content corresponded to such a degree that the stimulus could be recognized as the source of the dream.

I shall here cite a number of such dreams, collected by Jessen (p. 527), which are traceable to more or less accidental objective sensory stimuli. Every noise indistinctly perceived gives rise to corresponding dream- representations; the rolling of thunder takes us into the thick of battle, the crowing of a cock may be transformed into human shrieks of terror, and the creaking of a door may conjure up dreams of burglars breaking into the house. When one of our blankets slips off us at night we may dream that we are walking about naked, or falling into water. If we lie diagonally across the bed with our feet extending beyond the edge, we may dream of standing on the brink of a terrifying precipice, or of falling from a great height. Should our head accidentally get under the pillow we may imagine a huge rock overhanging us and about to crush us under its weight. An accumulation of semen produces voluptuous dreams, and local pains give rise to ideas of suffering ill-treatment, of hostile attacks, or of accidental bodily injuries....

"Meier (Versuch einer Erklarung des Nachtwandelns, Halle, 1758, p. 33) once dreamed of being attacked by several men who threw him flat on the ground and drove a stake into the earth between his first and second toes. While imagining this in his dream he suddenly awoke and felt a piece of straw sticking between his toes. The same author, according to Hemmings (Von den Traumen und Nachtwandlern, Weimar, 1784, p. 258), "dreamed on another occasion, when his nightshirt was rather too tight round his neck, that he was being hanged. In his youth Hoffbauer dreamed of having fallen from a high wall, and found, on waking, that the bedstead had come apart, and that he had actually fallen on to the floor.... Gregory relates that he once applied a hot-water bottle to his feet, and dreamed of taking a trip to the summit of Mount Etna, where he found the heat of the soil almost unbearable. After having a blister applied to his head, another man dreamed of being scalped by Indians; still another, whose shirt was damp, dreamed that he was dragged through a stream. An attack of gout caused a patient to believe that he was in the hands of the Inquisition, and suffering the pains of torture (Macnish)."

The argument that there is a resemblance between the dream-stimulus and the dream-content would be confirmed if, by a systematic induction of stimuli, we should succeed in producing dreams corresponding to these stimuli. According to Macnish such experiments had already been made by Giron de Buzareingues. "He left his knee exposed and dreamed of travelling on a mail- coach by night. He remarked, in this connection, that travellers were well aware how cold the knees become in a coach at night. On another occasion he left the back of his head uncovered, and dreamed that he was taking part in a religious ceremony in the open air. In the country where he lived it was customary to keep the head always covered except on occasions of this kind."

Maury reports fresh observation on self-induced dreams of his own. (A number of other experiments were unsuccessful.)

1. He was tickled with a feather on his lips and on the tip of his nose. He dreamed of an awful torture, viz., that a mask of pitch was stuck to his face and then forcibly torn off, bringing the skin with it.

2. Scissors were whetted against a pair of tweezers. He heard bells ringing, then sounds of tumult which took him back to the days of the Revolution of 1848.

3. Eau de Cologne was held to his nostrils. He found himself in Cairo, in the shop of Johann Maria Farina. This was followed by fantastic adventures which he was not able to recall.

4. His neck was lightly pinched. He dreamed that a blister was being applied, and thought of a doctor who had treated him in childhood.

5. A hot iron was brought near his face. He dreamed that chauffeurs[14] had broken into the house, and were forcing the occupants to give up their money by thrusting their feet into braziers. The Duchesse d'Abrantes, whose secretary he imagined himself to be then entered the room.

6. A drop of water was allowed to fall on to his forehead. He imagined himself in Italy, perspiring heavily, and drinking the white wine of Orvieto.

7. When the light of a candle screened with red paper was allowed to fall on his face, he dreamed of thunder, of heat, and of a storm at sea which he once witnessed in the English Channel.

Hervey, Weygandt, and others have made attempts to produce dreams experimentally.

Many have observed the striking skill of the dream in interweaving into its structure sudden impressions from the outer world, in such a manner as to represent a gradually approaching catastrophe (Hildebrandt). "In former years," this author relates, "I occasionally made use of an alarm-clock in order to wake punctually at a certain hour in the morning. It probably happened hundreds of times that the sound of this instrument fitted into an apparently very long and connected dream, as though the entire dream had been especially designed for it, as though it found in this sound its appropriate and logically indispensable climax, its inevitable denouement."

I shall presently have occasion to cite three of these alarm-clock dreams in a different connection.

Volkelt (p. 68) relates: "A composer once dreamed that he was teaching a class, and was just explaining something to his pupils. When he had finished he turned to one of the boys with the question: 'Did you understand me?' The boy cried out like one possessed 'Oh, ja!' Annoyed by this, he reprimanded his pupil for shouting. But now the entire class was screaming 'Orja,' then 'Eurjo,' and finally 'Feuerjo.' He was then aroused by the actual fire alarm in the street."

Garnier (Traite des facultes de l'ame, 1865), on the authority of Radestock, relates that Napoleon I, while sleeping in a carriage, was awakened from a dream by an explosion which took him back to the crossing of the Tagliamento and the bombardment of the Austrians, so that he started up, crying, "We have been undermined."

The following dream of Maury's has become celebrated: He was ill in bed; his mother was sitting beside him. He dreamed of the Reign of Terror during the Revolution. He witnessed some terrible scenes of murder, and finally he himself was summoned before the Tribunal. There he saw Robespierre, Marat, Fouquier-Tinville, and all the sorry heroes of those terrible days; he had to give an account of himself, and after all manner of incidents which did not fix themselves in his memory, he was sentenced to death. Accompanied by an enormous crowd, he was led to the place of execution. He mounted the scaffold; the executioner tied him to the plank, it tipped over, and the knife of the guillotine fell. He felt his head severed from his trunk, and awakened in terrible anxiety, only to find that the head-board of the bed had fallen, and had actually struck the cervical vertebrae just where the knife of the guillotine would have fallen.

This dream gave rise to an interesting discussion, initiated by Le Lorrain and Egger in the Revue Philosophique, as to whether, and how, it was possible for the dreamer to crowd together an amount of dream-content apparently so large in the short space of time elapsing between the perception of the waking stimulus and the moment of actual waking.

Examples of this nature show that objective stimuli occurring in sleep are among the most firmly-established of all the sources of dreams; they are, indeed, the only stimuli of which the layman knows anything whatever. If we ask an educated person who is not familiar with the literature of dreams how dreams originate, he is certain to reply by a reference to a case known to him in which a dream has been explained after waking by a recognized objective stimulus. Science, however, cannot stop here, but is incited to further investigation by the observation that the stimulus influencing the senses during sleep does not appear in the dream at all in its true form, but is replaced by some other representation, which is in some way related to it. But the relation existing between the stimulus and the resulting dream is, according to Maury, "une affinite quelconque mais qui n'est pas unique et exclusive"[15] (p. 72). If we read, for example, three of Hildebrandt's "alarm-clock dreams," we shall be compelled to ask why the same casual stimulus evoked so many different results, and why just these results and no others.

(p. 37): "I am taking a walk on a beautiful spring morning. I stroll through the green meadows to a neighbouring village, where I see numbers of the inhabitants going to church, wearing their best clothes and carrying their hymn-books under their arms. I remember that it is Sunday, and that the morning service will soon begin. I decide to attend it, but as I am rather overheated I think I will wait in the churchyard until I am cooler. While reading the various epitaphs, I hear the sexton climbing the church- tower, and I see above me the small bell which is about to ring for the beginning of service. For a little while it hangs motionless; then it begins to swing, and suddenly its notes resound so clearly and penetratingly that my sleep comes to an end. But the notes of the bell come from the alarm-clock."

"A second combination. It is a bright winter day; the streets are deep in snow. I have promised to go on a sleigh-ride, but I have to wait some time before I am told that the sleigh is at the door. Now I am preparing to get into the sleigh. I put on my furs, the foot-warmer is put in, and at last I have taken my seat. But still my departure is delayed. At last the reins are twitched, the horses start, and the sleigh bells, now violently shaken, strike up their familiar music with a force that instantly tears the gossamer of my dream. Again it is only the shrill note of my alarm-clock."

"Yet a third example. I see the kitchen-maid walking along the passage to the dining-room, with a pile of several dozen plates. The porcelain column in her arms seems to me to be in danger of losing its equilibrium. 'Take care,' I exclaim, 'you will drop the whole pile!' The usual retort is naturally made- that she is used to such things, etc. Meanwhile I continue to follow her with my anxious gaze, and behold, at the threshold the fragile plates fall and crash and roll across the floor in hundreds of pieces. But I soon perceive that the endless din is not really a rattling but a true ringing, and with this ringing the dreamer now becomes aware that the alarm-clock has done its duty."

The question why the dreaming mind misjudges the nature of the objective sensory stimulus has been answered by Strumpell, and in an almost identical fashion by Wundt; their explanation is that the reaction of the mind to the stimulus attacking sleep is complicated and confused by the formation of illusions. A sensory impression is recognized by us and correctly interpreted- that is, it is classed with the memory-group to which it belongs according to all previous experience if the impression is strong, clear, and sufficiently prolonged, and if we have sufficient time to submit it to those mental processes. But if these conditions are not fulfilled we mistake the object which gives rise to the impression, and on the basis of this impression we construct an illusion. "If one takes a walk in an open field and perceives indistinctly a distant object, it may happen that one will at first take it for a horse." On closer inspection the image of a cow, resting, may obtrude itself, and the picture may finally resolve itself with certainty into a group of people sitting on the ground. The impressions which the mind receives during sleep from external stimuli are of a similarly indistinct nature; they give rise to illusions because the impression evokes a greater or lesser number of memory-images, through which it acquires its psychic value. As for the question, in which of the many possible spheres of memory the corresponding images are aroused, and which of the possible associative connections are brought into play, that- to quote Strumpell again- is indeterminable, and is left, as it were, to the caprices of the mind.

Here we may take our choice. We may admit that the laws of dream-formation cannot really be traced any further, and so refrain from asking whether or not the interpretation of the illusion evoked by the sensory impression depends upon still other conditions; or we may assume that the objective sensory stimulus encroaching upon sleep plays only a modest role as a dream- source, and that other factors determine the choice of the memory-image to be evoked. Indeed, on carefully examining Maury's experimentally produced dreams, which I have purposely cited in detail, one is inclined to object that his investigations trace the origin of only one element of the dreams, and that the rest of the dream-content seems too independent and too full of detail to be explained by a single requirement, namely, that it must correspond with the element experimentally introduced. Indeed, one even begins to doubt the illusion theory, and the power of objective impressions to shape the dream, when one realizes that such impressions are sometimes subjected to the most peculiar and far-fetched interpretations in our dreams. Thus M. Simon tells of a dream in which he saw persons of gigantic stature[16] seated at a table, and heard distinctly the horrible clattering produced by the impact of their jaws as they chewed their food. On waking he heard the clatter of a horse's hooves as it galloped past his window. If in this case the sound of the horse's hooves had revived ideas from the memory-sphere of Gulliver's Travels, the sojourn with the giants of Brobdingnag, and the virtuous horse-like creatures- as I should perhaps interpret the dream without any assistance on the author's part- ought not the choice of a memory-sphere so alien to the stimulus to be further elucidated by other motives?

2. Internal (subjective) sensory stimuli

All objections to the contrary notwithstanding, we must admit that the role of the objective sensory stimuli as producers of dreams has been indisputably established, and if, having regard to their nature and their frequency, these stimuli seem perhaps insufficient to explain all dream- pictures, this indicates that we should look for other dream-sources which act in a similar fashion. I do not know where the idea first arose that together with the external sensory stimuli the internal (subjective) stimuli should also be considered, but as a matter of fact this has been done more or less explicitly in all the more recent descriptions of the aetiology of dreams. "I believe," says Wundt (p. 363), "that an important part is played in dream-illusions by those subjective sensations of sight and hearing which are familiar to us in the waking state as a luminous chaos in the dark field of the vision, and a ringing, buzzing, etc., of the ears, and in especial, subjective irritations of the retina. This explains the remarkable tendency of dreams to delude the eyes with numbers of similar or identical objects. Thus we see outspread before our eyes innumerable birds, butterflies, fishes, coloured beads, flowers, etc. Here the luminous dust in the dark field of vision has assumed fantastic forms, and the many luminous points of which it consists are embodied in our dreams in as many single images, which, owing to the mobility of the luminous chaos, are seen as moving objects. This is perhaps the reason of the dream's decided preference for the most varied animal forms, for owing to the multiplicity of such forms they can readily adapt themselves to the subjective luminous images."

The subjective sensory stimuli as a source of dreams have the obvious advantage that, unlike objective stimuli, they are independent of external accidents. They are, so to speak, at the disposal of the interpretation whenever they are required. But they are inferior to the objective sensory stimuli by the fact that their claim to the role of dream-inciters- which observation and experiment have established in the case of objective stimuli- can in their case be verified with difficulty or not at all. The main proof of the dream-inciting power of subjective sensory stimuli is afforded by the so-called hypnogogic hallucinations, which have been described by Johann Muller as "phantastic visual manifestations." They are those very vivid and changeable pictures which with many people occur constantly during the period of falling asleep, and which may linger for a while even after the eyes have been opened. Maury, who was very subject to these pictures, made a thorough study of them, and maintained that they were related to or rather identical with dream-images. This had already been asserted by Johann Muller. Maury maintains that a certain psychic passivity is necessary for their origin; that it requires a relaxation of the intensity of attention (p. 59). But one may perceive a hypnogogic hallucination in any frame of mind if one falls into such a lethargy for a moment, after which one may perhaps wake up, until this oft-repeated process terminates in sleep. According to Maury, if one wakes up shortly after such an experience, it is often possible to trace in the dream the images which one has perceived before falling asleep as hypnogogic hallucinations (p. 134). Thus Maury on one occasion saw a series of images of grotesque figures with distorted features and curiously dressed hair, which obtruded themselves upon him with incredible importunity during the period of falling asleep, and which, upon waking, he recalled having seen in his dream. On another occasion, while suffering from hunger, because he was subjecting himself to a rather strict diet, he saw in one of his hypnogogic states a plate, and a hand armed with a fork taking some food from the plate. In his dream he found himself at a table abundantly supplied with food, and heard the clatter of the diner's forks. On yet another occasion, after falling asleep with strained and painful eyes, he had a hypnogogic hallucination of microscopically small characters, which he was able to decipher, one by one, only with a great effort; and on waking from sleep an hour later he recalled a dream in which there was an open book with very small letters, which he was obliged to read through with laborious effort.

Not only pictures, but auditory hallucinations of words, names, etc., may also occur hypnogogically, and then repeat themselves in the dream, like an overture announcing the principal motif of the opera which is to follow.

A more recent observer of hypnogogic hallucinations, G. Trumbull Ladd, follows the same lines as Johann Muller and Maury. By dint of practice he succeeded in acquiring the faculty of suddenly arousing himself, without opening his eyes, two to five minutes after gradually falling asleep. This enabled him to compare the disappearing retinal sensations with the dream- images remaining in his memory. He assures us that an intimate relation between the two can always be recognized, inasmuch as the luminous dots and lines of light spontaneously perceived by the retina produce, so to speak, the outline or scheme of the psychically perceived dream-images. For example, a dream in which he saw before him clearly printed lines, which he read and studied, corresponded with a number of luminous spots arranged in parallel lines; or, to express it in his own words: The clearly printed page resolved itself into an object which appeared to his waking perception like part of an actual printed page seen through a small hole in a sheet of paper, but at a distance too great to permit of its being read. Without in any way underestimating the central element of the phenomenon, Ladd believes that hardly any visual dream occurs in our minds that is not based on material furnished by this internal condition of retinal irritability. This is particularly true of dreams which occur shortly after falling asleep in a dark room, while dreams occurring in the morning, near the period of waking, receive their stimulus from the objective light penetrating the eye in a brightly-lit room. The shifting and infinitely variable character of the spontaneous luminous excitations of the retina exactly corresponds with the fitful succession of images presented to us in our dreams. If we attach any importance to Ladd's observations, we cannot underrate the productiveness of this subjective source of stimuli; for visual images, as we know, are the principal constituents of our dreams. The share contributed by the other senses, excepting, perhaps, the sense of hearing, is relatively insignificant and inconstant.

3. Internal (organic) physical stimuli

If we are disposed to look for the sources of dreams not outside but inside the organism, we must remember that almost all our internal organs, which in a state of health hardly remind us of their existence, may, in states of excitation- as we call them- or in disease, become a source of the most painful sensations, and must therefore be put on a par with the external excitants of pain and sensation. Strumpell, for example, gives expression to a long-familiar experience when he declares that "during sleep the psyche becomes far more deeply and broadly conscious of its coporality than in the waking state, and it is compelled to receive and to be influenced by certain stimulating impressions originating in parts of the body, and in alterations of the body, of which it is unconscious in the waking state." Even Aristotle declares it to be quite possible that a dream may draw our attention to incipient morbid conditions which we have not noticed in the waking state (owing to the exaggerated intensity of the impressions experienced in the dream; and some medical authors, who certainly did not believe in the prophetic nature of dreams, have admitted the significance of dreams, at least in so far as the predicting of disease is concerned. [Cf. M. Simon, p. 31, and many earlier writers.][17]

Among the Greeks there were dream oracles, which were vouchsafed to patients in quest of recovery. The patient betook himself to the temple of Apollo or Aesculapius; there he was subjected to various ceremonies, bathed, rubbed and perfumed. A state of exaltation having been thus induced, he was made to lie down in the temple on the skin of a sacrificial ram. He fell asleep and dreamed of remedies, which he saw in their natural form, or in symbolic images which the priests afterwards interpreted.

For further references concerning the remedial dreams of the Greeks, cf. Lehmann, i, 74; Bouche-Leclerq; Hermann, Gottesd. Altert. d. Gr., SS 41; Privataltert. SS 38, 16; Bottinger in Sprengel's Beitr. z. Gesch. d. Med., ii, p. 163, et seq.; W. Lloyd, Magnetism and Mesmerism in Antiquity, London, 1877; Dollinger, Heidentum und Judentum, p. 130.

Even in our days there seems to be no lack of authenticated examples of such diagnostic achievements on the part of dreams. Thus Tissie cites from Artigues (Essai sur la valeur semeiologique des Reves) the history of a woman of forty-three, who, during several years of apparently perfect health, was troubled with anxiety-dreams, and in whom a medical examination subsequently revealed an incipient affection of the heart, to which she presently succumbed.

Serious derangements of the internal organs clearly excite dreams in quite a number of persons. The frequency of anxiety-dreams in diseases of the heart and lungs has been generally realized; indeed, this function of the dream-life is emphasized by so many writers that I shall here content myself with a reference to the literature of the subject (Radestock, Spitta, Maury, M. Simon, Tissie). Tissie even believes that the diseased organs impress upon the dream-content its characteristic features. The dreams of persons suffering from diseases of the heart are generally very brief, and end in a terrified awakening; death under terrible circumstances almost always find a place in their content. Those suffering from diseases of the lungs dream of suffocation, of being crushed, and of flight, and a great many of them are subject to the familiar nightmare- which, by the way, Borner has succeeded in inducing experimentally by lying on the face and covering the mouth and nostrils. In digestive disturbances the dream contains ideas from the sphere of gustatory enjoyment and disgust. Finally, the influence of sexual excitement on the dream-content is obvious enough in everyone's experience, and provides the strongest confirmation of the whole theory of dream-instigation by organic sensation.

Moreover, if we study the literature of dreams it becomes quite evident that some writers (Maury, Weygandt) have been led to the study of dream- problems by the influence their own pathological state has had on the content of their dreams.

The enlargement of the number of dream-sources by such undeniably established facts is, however, not so important as one might be led to suppose; for dreams are, after all, phenomena which occur in healthy persons- perhaps in all persons, and every night- and a pathological state of the organs is evidently not one of the indispensable conditions. For us, however, the question is not whence particular dreams originate, but rather: what is the exciting cause of ordinary dreams in normal people?

But we have only to go a step farther to find a source of dreams which is more prolific than any of those mentioned above, and which promises indeed to be inexhaustible. If it is established that the bodily organs become, in sickness, an exciting source of dreams, and if we admit that the mind, when diverted during sleep from the outer world, can devote more of its attention to the interior of the body, we may readily assume that the organs need not necessarily become diseased in order to permit stimuli, which in one way or another grow into dream-images, to reach the sleeping mind. What in the waking state we vaguely perceive as a general sensation, perceptible by its quality alone- a sensation to which, in the opinion of physicians, all the organic systems contribute their share- this general sensation would at night attain a greater potency, and, acting through its individual components, would constitute the most prolific as well as the most usual source of dream-representations. We should then have to discover the laws by which organic stimuli are translated into dream- representations.

This theory of the origin of dreams is the one most favoured by all medical writers. The obscurity which conceals the essence of our being- the "moi splanchnique" as Tissie terms it- from our knowledge, and the obscurity of the origin of dreams, correspond so closely that it was inevitable that they should be brought into relation with one another. The theory according to which the organic sensations are responsible for dreams has, moreover, another attraction for the physician, inasmuch as it favours the aetiological union of the dream with mental derangement, both of which reveal so many points of agreement in their manifestations, since changes in the general organic massive sensation and in the stimuli emanating from the internal organs are also considered to have a far-reaching significance as regards the origin of the psychoses. It is therefore not surprising that the organic stimulus theory can be traced to several writers who have propounded this theory independently.

A number of writers have followed the train of thought developed by Schopenhauer in 1851. Our conception of the universe has its origin in the recasting by the intellect of the impressions which reach it from without in the moulds of time, space and causality. During the day the stimuli proceeding from the interior of the organism, from the sympathetic nervous system, exert at most an unconscious influence on our mood. At night, however, when the overwhelming effect of the impressions of the day is no longer operative, the impressions that surge upward from within are able to force themselves on our attention- just as in the night we hear the rippling of the brook that was drowned in the clamour of the day. But how else can the intellect react to these stimuli than by transforming them in accordance with its own function into things which occupy space and time and follow the lines of causality?- and so a dream originates. Thus Scherner, and after him Volkelt, endeavoured to discover the more intimate relations between physical sensations and dream-pictures; but we shall reserve the discussion of this point for our chapter on the theory of dreams.

As a result of a singularly logical analysis, the psychiatrist Krauss referred the origin of dreams, and also of deliria and delusions, to the same element, namely, to organically determined sensations. According to him, there is hardly any part of the organism which might not become the starting-point of a dream or a delusion. Organically determined sensations, he says, "may be divided into two classes: (1) general sensations- those affecting the whole system; (2) specific sensations- those that are immanent in the principal systems of the vegetative organism, and which may in turn be subdivided into five groups: (a) the muscular, (b) the pneumatic, (c) the gastric, (d) the sexual, (e) the peripheral sensations (p. 33 of the second article)."

The origin of the dream-image from physical sensations is conceived by Krauss as follows: The awakened sensation, in accordance with some law of association, evokes an idea or image bearing some relation to it, and combines with this idea or image, forming an organic structure, towards which, however, the consciousness does not maintain its normal attitude. For it does not bestow any attention on the sensation, but concerns itself entirely with the accompanying ideas; and this explains why the facts of the case have been so long misunderstood (p. 11 ff.). Krauss even gives this process the special name of "transubstantiation of the sensations into dream-images" (p. 24).

The influence of organic physical stimuli on the formation of dreams is today almost universally admitted, but the question as to the nature of the law underlying this relation is answered in various ways, and often obscurely. On the basis of the theory of physical excitation the special task of dream-interpretation is to trace back the content of a dream to the causative organic stimulus, and if we do not accept the rules of interpretation advanced by Scherner, we shall often find ourselves confronted by the awkward fact that the organic source of excitation reveals itself only in the content of the dream.

A certain agreement, however, appears in the interpretation of the various forms of dreams which have been designated as "typical," because they recur in so many persons with almost the same content. Among these are the well- known dreams of falling from a height, of the dropping out of teeth, of flying, and of embarrassment because one is naked or scantily clad. This last type of dream is said to be caused simply by the dreamer's perception, felt in his sleep, that he has thrown off the bedclothes and is uncovered. The dream that one's teeth are dropping out is explained by "dental irritation," which does not, however, of necessity imply a morbid condition of irritability in the teeth. According to Strumpell, the flying dream is the adequate image employed by the mind to interpret the quantum of stimulus emanating from the rising and sinking of the pulmonary lobes when the cutaneous sensation of the thorax has lapsed into insensibility. This latter condition causes the sensation which gives rise to images of hovering in the air. The dream of falling from a height is said to be due to the fact that an arm falls away from the body, or a flexed knee is suddenly extended, after unconsciousness of the sensation of cutaneous pressure has supervened, whereupon this sensation returns to consciousness, and the transition from unconsciousness to consciousness embodies itself psychically as a dream of falling (Strumpell, p. 118). The weakness of these fairly plausible attempts at explanation clearly lies in the fact that without any further elucidation they allow this or that group of organic sensations to disappear from psychic perception, or to obtrude themselves upon it, until the constellation favourable for the explanation has been established. Later on, however, I shall have occasion to return to the subject of typical dreams and their origin.

From a comparison of a series of similar dreams, M. Simon endeavoured to formulate certain rules governing the influence of organic sensations on the nature of the resulting dream. He says (p. 34): "If during sleep any organic apparatus, which normally participates in the expression of an affect, for any reason enters into the state of excitation to which it is usually aroused by the affect, the dream thus produced will contain representations which harmonize with that affect."

Another rule reads as follows (p. 35): "If, during sleep, an organic apparatus is in a state of activity, stimulation, or disturbance, the dream will present ideas which correspond with the nature of the organic function performed by that apparatus."

Mourly Vold has undertaken to prove the supposed influence of bodily sensation on the production of dreams by experimenting on a single physiological territory. He changed the positions of a sleeper's limbs, and compared the resulting dreams with these changes. He recorded the following results:

1. The position of a limb in a dream corresponds approximately to that of reality, i.e., we dream of a static condition of the limb which corresponds with the actual condition.

2. When one dreams of a moving limb it always happens that one of the positions occurring in the execution of this movement corresponds with the actual position.

3. The position of one's own limb may in the dream be attributed to another person.

4. One may also dream that the movement in question is impeded.

5. The limb in any particular position may appear in the dream as an animal or monster, in which case a certain analogy between the two is established.

6. The behaviour of a limb may in the dream incite ideas which bear some relation or other to this limb. Thus, for example, if we are using our fingers we dream of numerals.

Results such as these would lead me to conclude that even the theory of organic stimulation cannot entirely abolish the apparent freedom of the determination of the dream-picture which will be evoked.[18]

4. Psychic sources of excitation

When considering the relation of dreams to waking life, and the provenance of the material of dreams, we learned that the earliest as well as the most recent investigators are agreed that men dream of what they do during the day, and of the things that interest them in the waking state. This interest, continued from waking life into sleep, is not only a psychic bond, joining the dream to life, but it is also a source of dreams whose importance must not be underestimated, and which, taken together with those stimuli which become active and of interest during sleep, suffices to explain the origin of all dream-images. Yet we have also heard the very contrary of this asserted; namely, that dreams bear the sleeper away from the interests of the day, and that in most cases we do not dream of things which have occupied our attention during the day until after they have lost, for our waking life, the stimulating force of belonging to the present. Hence in the analysis of dream-life we are reminded at every step that it is inadmissible to frame general rules without making provision for qualifications by introducing such terms as "frequently," "as a rule," "in most cases," and without being prepared to admit the validity of exceptions.

If interest during the waking state together with the internal and external stimuli that occur during sleep, sufficed to cover the whole aetiology of dreams, we should be in a position to give a satisfactory account of the origin of all the elements of a dream; the problem of the dream-sources would then be solved, leaving us only the task of discriminating between the part played by the psychic and that played by the somatic dream-stimuli in individual dreams. But as a matter of fact no such complete solution of a dream has ever been achieved in any case, and everyone who has attempted such a solution has found that components of the dream- and usually a great many of them- are left whose source he is unable to trace. The interests of the day as a psychic source of dreams are obviously not so influential as to justify the confident assertion that every dreamer continues the activities of his waking life in his dreams.

Other dream-sources of a psychic nature are not known. Hence, with the exception perhaps of the explanation of dreams given by Scherner, to which reference will be made later on, all the explanations found in the literature of the subject show a considerable hiatus whenever there is a question of tracing the images and ideas which are the most characteristic material of dreams. In this dilemma the majority of authors have developed a tendency to belittle as far as possible the share of the psychic factor, which is so difficult to determine, in the evocation of dreams. To be sure, they distinguish as major divisions the nerve-stimulus dream and the association-dream, and assert that the latter has its source exclusively in reproduction (Wundt, p. 365), but they cannot dismiss the doubt as to "whether they appear without any impulsion from organic stimuli" (Volkelt, p. 127). And even the characteristic quality of the pure association-dream disappears. To quote Volkelt (p. 118): "In the association-dream proper, there is no longer any question of such a stable nucleus. Here the loose grouping penetrates even to the very centre of the dream. The imaginative life, already released from the control of reason and intellect, is here no longer held together by the more important psychical and physical stimuli, but is left to its own uncontrolled and confused divagations." Wundt, too, attempts to belittle the psychic factor in the evocation of dreams by asserting that "the phantasms of the dream are perhaps unjustly regarded as pure hallucinations. Probably most dream-representations are really illusions, inasmuch as they emanate from the slight sensory impressions which are never extinguished during sleep" (p. 359, et seq.). Weygandt has adopted this view, and generalizes upon it. He asserts that "the most immediate causes of all dream-representations are sensory stimuli to which reproductive associations then attach themselves" (p. 17). Tissie goes still further in suppressing the psychic sources of excitation (p. 183): "Les reves d'origine absolument psychique n'existent pas";[19] and elsewhere (p. 6), "Les pensees de nos reves nous viennent de dehors...."[20]

Those writers who, like the eminent philosopher Wundt, adopt a middle course, do not hesitate to assert that in most dreams there is a cooperation of the somatic stimuli and psychic stimuli which are either unknown or are identified with the interests of the day.

We shall learn later that the problem of dream-formation may be solved by the disclosure of an entirely unsuspected psychic source of excitation. In the meanwhile we shall not be surprised at the over-estimation of the influence of those stimuli which do not originate in the psychic life. It is not merely because they alone may easily be found, and even confirmed by experiment, but because the somatic conception of the origin of dreams entirely corresponds with the mode of thought prevalent in modern psychiatry. Here, it is true, the mastery of the brain over the organism is most emphatically stressed; but everything that might show that the psychic life is independent of demonstrable organic changes, or spontaneous in its manifestations, is alarming to the contemporary psychiatrist, as though such an admission must mean a return to the old-world natural philosophy and the metaphysical conception of the nature of the soul. The distrust of the psychiatrist has placed the psyche under tutelage, so to speak; it requires that none of the impulses of the psyche shall reveal an autonomous power. Yet this attitude merely betrays a lack of confidence in the stability of the causal concatenation between the physical and the psychic. Even where on investigation the psychic may be recognized as the primary cause of a phenomenon, a more profound comprehension of the subject will one day succeed in following up the path that leads to the organic basis of the psychic. But where the psychic must, in the present state of our knowledge, be accepted as the terminus, it need not on that account be disavowed.

D. Why Dreams Are Forgotten After Waking

That a dream fades away in the morning is proverbial. It is, indeed, possible to recall it. For we know the dream, of course, only by recalling it after waking; but we very often believe that we remember it incompletely, that during the night there was more of it than we remember. We may observe how the memory of a dream which in the morning was still vivid fades in the course of the day, leaving only a few trifling remnants. We are often aware that we have been dreaming, but we do not know of what we have dreamed; and we are so well used to this fact- that the dream is liable to be forgotten- that we do not reject as absurd the possibility that we may have been dreaming even when, in the morning, we know nothing either of the content of the dream or of the fact that we have dreamed. On the other hand, it often happens that dreams manifest an extraordinary power of maintaining themselves in the memory. I have had occasion to analyse, with my patients, dreams which occurred to them twenty-five years or more previously, and I can remember a dream of my own which is divided from the present day by at least thirty-seven years, and yet has lost nothing of its freshness in my memory. All this is very remarkable, and for the present incomprehensible.

The forgetting of dreams is treated in the most detailed manner by Strumpell. This forgetting is evidently a complex phenomenon; for Strumpell attributes it not to a single cause, but to quite a number of causes.

In the first place, all those factors which induce forgetfulness in the waking state determine also the forgetting of dreams. In the waking state we commonly very soon forget a great many sensations and perceptions because they are too slight to remember, and because they are charged with only a slight amount of emotional feeling. This is true also of many dream-images; they are forgotten because they are too weak, while the stronger images in their neighbourhood are remembered. However, the factor of intensity is in itself not the only determinant of the preservation of dream-images; Strumpell, as well as other authors (Calkins), admits that dream-images are often rapidly forgotten although they are known to have been vivid, whereas, among those that are retained in the memory, there are many that are very shadowy and unmeaning. Besides, in the waking state one is wont to forget rather easily things that have happened only once, and to remember more readily things which occur repeatedly. But most dream-images are unique experiences,[21] and this peculiarity would contribute towards the forgetting of all dreams equally. Of much greater significance is a third cause of forgetting. In order that feelings, representations, ideas and the like should attain a certain degree of memorability, it is important that they should not remain isolated, but that they should enter into connections and associations of an appropriate nature. If the words of a verse of poetry are taken and mixed together, it will be very difficult to remember them. "Properly placed, in a significant sequence, one word helps another, and the whole, making sense, remains and is easily and lastingly fixed in the memory. Contradictions, as a rule, are retained with just as much difficulty and just as rarely as things that are confused and disorderly." Now dreams, in most cases, lack sense and order. Dream-compositions, by their very nature, are insusceptible of being remembered, and they are forgotten because as a rule they fall to pieces the very next moment. To be sure, these conclusions are not entirely consistent with Radestock's observation (p. 168), that we most readily retain just those dreams which are most peculiar.

According to Strumpell, other factors, deriving from the relation of the dream to the waking state, are even more effective in causing us to forget our dreams. The forgetfulness of dreams manifested by the waking consciousness is evidently merely the counterpart of the fact already mentioned, namely, that the dream hardly ever takes over an orderly series of memories from the waking state, but only certain details of these memories, which it removes from the habitual psychic connections in which they are remembered in the waking state. The dream-composition, therefore, has no place in the community of the psychic series which fill the mind. It lacks all mnemonic aids. "In this manner the dream-structure rises, as it were, from the soil of our psychic life, and floats in psychic space like a cloud in the sky, quickly dispelled by the first breath of reawakening life" (p. 87). This situation is accentuated by the fact that on waking the attention is immediately besieged by the inrushing world of sensation, so that very few dream-images are capable of withstanding its force. They fade away before the impressions of the new day like the stars before the light of the sun.

Finally, we should remember that the fact that most people take but little interest in their dreams is conducive to the forgetting of dreams. Anyone who for some time applies himself to the investigation of dreams, and takes a special interest in them, usually dreams more during that period than at any other; he remembers his dreams more easily and more frequently.

Two other reasons for the forgetting of dreams, which Bonatelli (cited by Benini) adds to those adduced by Strumpell, have already been included in those enumerated above; namely, (1) that the difference of the general sensation in the sleeping and the waking state is unfavourable to mutual reproduction, and (2) that the different arrangement of the material in the dream makes the dream untranslatable, so to speak, for the waking consciousness.

It is therefore all the more remarkable, as Strumpell himself observes, that, in spite of all these reasons for forgetting the dream, so many dreams are retained in the memory. The continual efforts of those who have written on the subject to formulate laws for the remembering of dreams amount to an admission that here, too, there is something puzzling and unexplained. Certain peculiarities relating to the remembering of dreams have attracted particular attention of late; for example, the fact that the dream which is believed to be forgotten in the morning may be recalled in the course of the day on the occasion of some perception which accidentally touches the forgotten content of the dream (Radestock, Tissie). But the whole recollection of dreams is open to an objection which is calculated greatly to depreciate its value in critical eyes. One may doubt whether our memory, which omits so much from the dream, does not falsify what it retains.

This doubt as to the exactness of the reproduction of dreams is expressed by Strumpell when he says: "It may therefore easily happen that the waking consciousness involuntarily interpolates a great many things in the recollection of the dream; one imagines that one has dreamt all sorts of things which the actual dream did not contain."

Jessen (p. 547) expresses himself in very decided terms:

"Moreover, we must not lose sight of the fact, hitherto little heeded, that in the investigation and interpretation of coherent and logical dreams we almost always take liberties with the truth when we recall a dream to memory. Unconsciously and unintentionally we fill up the gaps and supplement the dream-images. Rarely, and perhaps never, has a connected dream been as connected as it appears to us in memory. Even the most truth-loving person can hardly relate a dream without exaggerating and embellishing it in some degree. The human mind so greatly tends to perceive everything in a connected form that it intentionally supplies the missing links in any dream which is in some degree incoherent."

The observations of V. Eggers, though of course independently conceived, read almost like a translation of Jessen's words:

"...L'observation des reves a ses difficultes speciales et le seul moyen d'eviter toute erreur en pareille matiere est de confier au papier sans le moindre retard ce que l'on vient d'eprouver et de remarquer; sinon, l'oubli vient vite ou total ou partiel; l'oubli total est sans gravite; mais l'oubli partiel est perfide: car si l'on se met ensuite a raconter ce que l'on n'a pas oublie, on est expose a completer par imagination les fragments incoherents et disjoints fourni par la memoire... on devient artiste a son insu, et le recit, periodiquement repete s'impose a la creance de son auteur, qui, de bonne foi, le presente comme un fait authentique, dument etabli selon les bonnes methodes...."[22]

Similarly Spitta, who seems to think that it is only in the attempt to reproduce the dream that we bring order and arrangement into loosely associated dream-elements--"turning juxtaposition into concatenation; that is, adding the process of logical connection which is absent in the dream."

Since we can test the reliability of our memory only by objective means, and since such a test is impossible in the case of dreams, which are our own personal experience, and for which we know no other source than our memory, what value do our recollections of our dreams possess? 

¹The following remarks are based on Buchsenschutz's careful essay, Traum und Traumdeutung im Altertum (Berlin 1868).

²The relationship between dreams and disease is discussed by Hippocrates in a chapter of his famous work.

³Griechische Mythologie und Religionsgeschichte, p. 390.

⁴For the later history of dream-interpretation in the Middle Ages consult Diepgen, and the special investigations of M. Forster, Gotthard, and others. The interpretation of dreams among the Jews has been studied by Amoli, Amram, and Lowinger, and recently, with reference to the psycho- analytic standpoint, by Lauer. Details of the Arabic methods of dream- interpretation are furnished by Drexl, F. Schwarz, and the missionary Tfinkdji. The interpretation of dreams among the Japanese has been investigated by Miura and Iwaya, among the Chinese by Secker, and among the Indians by Negelein.

⁵We dream of what we have seen, said, desired, or done.

⁶Communicated by Winterstein to the Zentralblatt fur Psychoanalyse.

⁷And whatever be the pursuit to which one clings with devotion, whatever the things on which we have been occupied much in the past, the mind being thus more intent upon that pursuit, it is generally the same things that we seem to encounter in dreams; pleaders to plead their cause and collate laws, generals to contend and engage battle.

⁸And especially the "remnant" of our waking thoughts and deeds move and stir within the soul.

⁹Vaschide even maintains that it has often been observed that in one's dreams one speaks foreign languages more fluently and with greater purity than in the waking state.

¹⁰See Vaschide, p. 232.

¹¹Vaschide, p. 233

¹²That every impression, even the most insignificant, leaves an ineradicable mark, indefinitely capable of reappearing by day.

¹³From subsequent experience I am able to state that it is not at all rare to find in dreams reproductions of simple and unimportant occupations of everyday life, such as packing trunks, preparing food in the kitchen, etc., but in such dreams the dreamer himself emphasizes not the character of the recollection but its "reality"- "I really did this during the day."

¹⁴Chauffeurs were bands of robbers in the Vendee who resorted to this form of torture.

¹⁵A sort of relation which is, however, neither unique nor exclusive.

¹⁶Gigantic persons in a dream justify the assumption that the dream is dealing with a scene from the dreamer's childhood. This interpretation of the dream as a reminiscence of Gulliver's Travels is, by the way, a good example of how an interpretation should not be made. The dream-interpreter should not permit his own intelligence to operate in disregard of the dreamer's impressions.

¹⁷In addition to the diagnostic valuation of dreams (e.g., by Hippocrates) mention must also be made of their therapeutic significance in antiquity.

¹⁸See below for a further discussion of the two volumes of records of dreams since published by this writer.

¹⁹Dreams do not exist whose origin is totally psychic.

²⁰The thoughts of our dreams come from outside.

²¹Periodically recurrent dreams have been observed repeatedly. Compare the collection made by Chabaneix.

²² ...The observation of dreams has its special difficulties, and the only way to avoid all error in such matter is to put on paper without the least delay what has just been experienced and noticed; otherwise, totally or partially the dream is quickly forgotten; total forgetting is without seriousness; but partial forgetting is treacherous: for, if one then starts to recount what has not been forgotten, one is likely to supplement from the imagination the incoherent and disjointed fragments provided by the memory.... unconsciously one becomes an artist, and the story, repeated from time to time, imposes itself on the belief of its author, who, in good faith, tells it as authentic fact, regularly established according to proper methods.... 

(go on to Chapter1 part 2)

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