In the preceding chapters we have traced some of the elementary tendencies which prevail in the formation of dreams. These tendencies are in some respects so unlike those that rule in waking life—slight and subtle as their unlikeness often seems—that we are justified in regarding the psychic phenomena of sleeping life as constituting a world of their own.

Yet when we look at the phenomena a little more deeply we realise that, however differentiated they have become, dream life is yet strictly co-ordinated with other forms of psychic life. If we pierce below the surface we seem to reach a primitive fundamental psychic stage in which the dreamer, the madman, the child, and the savage alike have their starting point, and possess a degree of community from which the waking, civilised, sane adult of to-day is shut out, so that he can only comprehend it by an intellectual effort.[243] It thus happens that the ways of thinking and feeling of the child and the savage and the lunatic each furnish a road by which we may reach a psychic world which is essentially that of the dreamer.

The resemblance of insanity to dream life has, above all, impressed observers from the time when the nature of insanity was first definitely recognised. It would be outside the limits of the present book to discuss the points at which dreams resemble or differ from insanity, but it is worth while to touch on the question of their affinity. The recognition of this affinity, or at all events analogy, though it was stated by Cabanis to be due to Cullen, is as old as Aristotle, and has constantly been put forward afresh. Thus in the sixteenth century Du Laurens (A. Laurentius), in his treatise on the disease of melancholy, as insanity was then termed, compared it to dreaming.[244] The same point is still constantly brought forward by the more philosophic physician. 'Find out all about dreams,' Hughlings Jackson has said, 'and you will have found out all about insanity.' From the wider standpoint of the psychologist, Jastrow points out that not only insanity, but all the forms of delirium, including the drug-intoxications, are 'variants of dream consciousness.'

The reality of the affinity of dreaming and insanity is well illustrated by a case, coming under the observation of Marro, in which a dream, formed according to the ordinary rules of dreaming, produced a temporary fit of insanity in an otherwise perfectly sane subject.[245] In this case a highly intelligent but somewhat neurotic young man was returning to Italy after pursuing his studies abroad, and reached Turin, on the homeward journey, in a somewhat tired state. In the train he believed that he had detected some cardsharpers, and that they suspected him of finding them out, and bore him ill-will in consequence. This produced a state of general nervous apprehension. At the hotel his room was over the kitchen; it was in consequence very hot, and to a late hour he could still hear voices and catch snatches of conversation, which seemed to him to be directed against himself. His suspicions deepened, he heard noises, in reality due to the kitchen utensils, which seemed preparations for his murder, and he ultimately became convinced that there was a plot to set fire to his room in order to force him to leave it, when he would be seized and murdered. He resolved to escape, got out of the window with his revolver in his hand, found his way to another part of the house, encountered a man who had been awakened by his movements, and shot at him, believing him to be a party to the imaginary conspiracy. He was seized and taken to the asylum, where he speedily regained calm, and realised the delusion into which he had fallen. When questioned by Marro, on reaching the asylum, he was unaware that he had ever fallen asleep during the night; he could not, however, account for all the time that had elapsed before he left the room, and it was probable, Marro concludes, that he was in a state between waking and sleeping, and that his delusion was constituted in a dream. Fatigue, nervous apprehension, an unduly hot bedroom, the close proximity of servants' voices, and the sound of kitchen utensils, had thus combined, in a state of partial sleep, to produce in an otherwise sane person, a morbid condition in every respect identical with that found in insane persons who are suffering from systematised delusions of persecution.[246]

The resemblance of the child's psychic state to the dream state is an observation of less ancient date than that of the analogy between dreaming and insanity, but it has frequently been made by modern psychologists. 'In dreams,' says Freud, 'the child with his impulses lives again,'[247] and Giessler has devoted a chapter to the points of resemblance between dream life and the mental activity of children.[248]

I should be more especially inclined to find the dream-like character of the child's mind at three points: (1) the abnormally logical tendency of the child's mind and the daring mental fusions which he effects in forming theories; (2) the greater preponderance of hypnagogic phenomena and hallucinations in childhood, as well as the large element of reverie or day-dreaming in the child's life, and the facility with which he confuses this waking imagination with reality; and (3) the child's tendency to mistake, also, the dreams of the night for real events.[249] This last tendency is of serious practical import when it leads a child, in all innocence, to make criminal charges against other persons.[250] This tendency clearly indicates the close resemblance which there is for children between dream life and waking life; it also shows the great vividness which children's dreams possess. In imaginative children, it may be added, a rich and vivid dream life is not infrequently the direct source of literary activities which lead to distinction in later life.[251]

The child, we are often told, is the representative of the modern savage and the primitive man. That is not, in any strict sense, true, nor can we assume without question that early man and modern savages are identical. But we can have very little doubt that in our dreams we are brought near to ways of thought and feeling that are sometimes closer to those of early man, as well as of latter-day savages, than are our psychic modes in civilisation.[252] So remote are we to-day from the world of our dreams that we very rarely draw from them the inspiration of our waking lives. For the primitive man the laws of the waking world are not yet widely differentiated from the laws of the sleeping world, and he finds it not unreasonable to seek illumination for the problems of one world in the phenomena of the other. The doctrine of animism, as first formulated by Tylor (more especially in his Primitive Culture) finds in dreams the chief source of primitive religion and philosophy. Of recent years there has been a tendency to reject the theory of animism.[253] Certainly it is possible to rely too exclusively on dreams as the inspiration of early man; if the evidence of dreams had not been in a line with the evidence that he derived from other sources, there is no reason why the man of primitive times should have attached any peculiar value to dreams. But if the animistic conception presents too extreme a view of the primitive importance of dreaming, we must beware lest the reaction against it should lead us to fall into the opposite extreme. Durkheim argues that it is unlikely that early man attaches much significance to dreams, for the modern peasant, who is the representative of primitive man, appears to dream very little, and not to attach much importance to his dreams. But it is by no means true that the peasant of civilisation, with his fixed agricultural life, corresponds to early man who was mainly a hunter and often a nomad. Under the conditions of civilisation the peasant is fed regularly and leads a peaceful, stolid, laborious, and equable life, which is altogether unfavourable to psychic activity of any kind, awake or asleep. The savage man, now and ever, as a hunter and fighter, leads a life of comparative idleness, broken by spurts of violent activity; sometimes he can gorge himself with food, sometimes he is on the verge of starvation. He lives under conditions that are more favourable to the psychic side of life, awake or asleep, than is the case with the peasant of civilisation.

Moreover, it must be remembered that all the peoples whom we may fairly regard as in some degree resembling early man possess a specialised caste of exceptional men who artificially cultivate their psychic activities, and thereby exert great influence on their fellows. These are termed, after their very typical representatives in some Siberian tribes, shamans, and combine the functions of priests and sorcerers and medicine men. It is nearly everywhere found that the shaman—who is often, it would appear, at the outset a somewhat abnormal person—cultivates solitude, fasting, and all manner of ascetic practices, thereby acquiring an unusual aptitude to dream, to see visions, to experience hallucinations, and, it may well be, to acquire abnormally clairvoyant powers. The shamans of the Andamanese are called by a word signifying dreamer, and in various parts of the world the shaman finds the first sign of his vocation in a dream. The evocation of dreams is often the chief end of the shaman's abnormal method of life. Thus, among the Salish Indians of British Columbia, dreams are the proper mode of communication with guardian spirits, and 'prolonged fasts, bathings, forced vomitings, and other exhausting bodily exercises are the means adopted for inducing the mystic dreams and visions.'[254]

When we witness the phenomena of Shamanism in all parts of the world it is difficult to dispute the statement of Lucretius that the gods first appeared to men in dreams. This may be said to be literally true; even to-day it often happens that the savage's totem, who is practically his tutelary deity, first appears to him in a dream.[255] An influence which seems likely to have been so persistent may well have had a large plastic power in moulding the myths and legends which everywhere embody the religious impulses of men. This idea was long ago suggested by Hobbes. 'From this ignorance of how to distinguish dreams and other strong Fancies,' he wrote, 'from Vision and Sense, did arise the greatest part of the Religion of the Gentiles in time past, that worshipped Satyrs, Fauns, Nymphs, and the like.'[256]