How it comes that at the moment of the onset of the trance the explorer is freed from the limitations of his own date and place I cannot tell you. Suffice it that the process involves both a special organ in the brain and a special technique, which has to be learned through a long apprenticeship. In that moment of awakening the worker has seemingly a confused experience of all the great successive epochal phases of the human spirit, up to his own date. But as the content of that supreme moment almost wholly escapes his memory as soon as it is past, it is impossible to say anything definite about it. He seems, indeed, to see in a flash, as though from another dimension of time, the whole historical order of events. Of course, he sees them only schematically. Their vast complexity of detail cannot be grasped in an instantaneous view. What he experiences can only be described (unintelligibly I fear) as a summation of all happening, of all physical, mental and spiritual flux. One is tempted to say also that he is aware of the human aspect of this flux as a vast slumber of the spirit, punctuated with moments of watchfulness, a vast stagnation troubled here and there with tremors of tense activity. Though all this is seen in an instant, it does not appear static, but alive with real passage and change.

This sublime moment must not be permitted to endure, for it is lethal. Immediately the explorer must begin to select that part of the historical order which he desires to study. To do this he must adopt the fundamental attitude of mind, or temperamental flavour, which he knows to be distinctive of the desired period. This process demands very great skill, and involves a host of uncouth and nerve-racking experiences. As soon as he begins to succeed in assuming the appropriate mental attitude, all the periods save that which he has chosen fade out of his consciousness, and the chosen period becomes increasingly detailed. He has then to specialize his mental attitude still further, so as to select a particular phase or group-culture within his period. And this specialization he may carry further again, till he has brought himself into the mind of some particular individual at a particular moment. Having once gained a footing in the individual mind, he can henceforth follow all its experiences from within; or, if he prefers, he can remain in one moment of that mind, and study its microscopic detail.

Such is the essence of our method. First we have to attain the momentary glimpse of eternity, or, more precisely, to take up for one instant the point of view of eternity. Then by imagination and sympathy we have to re-enter the stream of time by assuming the fundamental form of the minds or the mind that we wish to observe. In this process we have to work by means of a very delicate ‘selectivity’, not wholly unlike that physical selectivity which you exercise when you pick up ethereal messages on a particular wavelength. But this process of picking up past minds is far more delicate, since the system of basic mental patterns is very much more complex than the one-dimensional series of wave-frequencies.

When our ancestors first acquired the power of ‘entering into the point of view of eternity’ they suffered many disasters through ignorance of its principles. Very many of the earliest explorers succumbed simply by failing to keep their bodies alive during the trance. Their sleep turned into death. Others fell into such violent convulsions that they damaged themselves irreparably, and were mercifully killed by the superintendents. In other cases the normal trance lasted indefinitely, the body remaining alive but unresponsive for millions of years. A section of the catacombs was until recently filled with these persons, who were looked after by the attendants in the hope that some day they might wake. But a few thousand years ago it was decided to do away with some, and use others for experimental purposes.

Of the early explorers who successfully emerged from ‘the point of view of eternity’ into some past epoch, many returned insane. Others, though sane when they woke, kept falling into the trance again and again. Others were so embittered by their experiences that they became plague-spots in the community, and had to be requested to stop their hearts. Of these, some few refused, and remained at large, doing so much damage that finally they were put to death. One or two of the pioneers, and one or two of my contemporaries also, have returned from the trance with a peculiar kind of insanity, which suggested that they had actually found their way into the future, and that they still regarded our contemporary world as an episode in the remote past. Unfortunately they could give no account of their experiences; but in one of the earliest cases the recorded ravings seem to refer to the Mad Star, which did not earn its name until long afterwards.

In the early stages of the work few persons were engaged on it, and all that they could do was to collect random incidents from the very recent past. Gradually, however, the technique was greatly improved. It became possible to inspect almost any sequence of events in the history of our own species. This could only be done because the basic mental patterns of all the races of our own species had already been fairly well worked out by our psychologists and historians. Later, however, the psychologists began to formulate a vast theoretical system of possible basic mental patterns; and after some barren experimenting the explorers finally learned to assume certain of these patterns in the trance. The result was startling. Not only did they, as was expected, gain access to many primitive cultures upon Neptune, but also they began to find themselves sometimes in alien worlds, apparently much smaller than their familiar planet. The proportions of common things were all altered. The seas rose into great waves; the lands were often buckled into huge mountain ranges. The native organisms, though unfortified by artificial atoms, were able to attain great size and yet remain slender and agile. And these facts were observed through the medium of human types the existence of which had never been guessed. The very planets which these races inhabited could not be identified. No wonder, since all traces of Earth and Venus had long ago been wiped out by the solar collision that had driven man to Neptune.

This discovery of Past worlds Was even more exciting to us than the discovery of America to your own ancestors; for it entailed incidentally the overthrow of a well-grounded theory, which traced the evolution of the human race to a primitive Neptunian organism. Interest in the exploration of the past now greatly increased. The technique was developed far beyond the dreams of the early explorers. Little by little the outline of man’s whole history on Earth and Venus Was plotted, and tract after tract of it was elaborated in some detail.

In observing these extinct species, the explorers found traces of experience very different from their own. Although, of course, the basic mental pattern or temperamental ground-plan was in every case one which the explorer himself had been able to conceive, and even in a manner assume, in order to make contact with these primitive beings at all, yet when the contact had been made, he seemed to enter into a new mental world. For instance, he had to deal with minds whose sensory powers were much more limited than his own. Looking through those Primitive eyes, he saw things in much less detail than through his own eyes, so that, though he observed everything with all the precision that his host’s crude vision could afford, yet everything seemed to him blurred, and out of focus. The colours of objects, too, were diluted and simplified; for several colours familiar to us are hidden from more primitive eyes. Consequently the world as seen through those eyes appears to us at first strangely drab, almost monochromatic, as though the observer himself had become partially colour-blind. The other senses also are impoverished. For instance, all touched shapes and textures seem curiously vague and muffled. The sensations of sexual intercourse, too, which with us are richly variegated and expressive, are reduced in the primitive to a nauseating sameness and formlessness. It is impossible for you to realize the jarring, maddening effects of this coarseness and emptiness of all the sensory fields, especially to the inexperienced explorer, who has not yet learned to submit his spirit generously to the primitive.

In the sphere of thought, we find all the primitive species of man, however different from one another, equally remote from ourselves. Even the most advanced members of the most advanced primitive species inhabit worlds of thought which to us seem naive and grotesque. The explorer finds himself condemned to cramp the wings of his mind within the caging of some gimcrack theory or myth, which, if he willed, he could easily shatter. Even in those rare cases in which the ground-plan of some edifice of primitive thought happens to be true to the simplest basic facts of the cosmos, as in your own theory of relativity, the superstructure which it ought to support is wholly absent. The explorer thus has the impression that the cosmos, with himself in it, has been flattened into a two-dimensional map.

In the sphere of desire the explorer has to deal with very unfamiliar and very jarring kinds of experience. In all human species, of course, the most fundamental animal desires are much the same, the desires for safety, food, a mate, and companionship; but the kind of food, the kind of companionship, and so on, which the primitive human mind seeks, are often very foreign and distasteful to us. Take the case of food. Of course the explorer’s body, lying in the catacombs on Neptune, does not, if perchance he is inhabiting some primitive glutton of the past, suffer dyspepsia; save occasionally, through the influence of suggestion. But none the less he may experience acute distress, for his brain is forced to accept sensory complexes of overeating which in normal life would disgust him. And they disgust him now. Even when overeating does not occur, the food percepts are often repulsive to our centres of taste and odour. In the matter of personal beauty, too, the explorer is at first repelled by the grotesque caricature of humanity which among primitive species passes for perfection, much as you yourselves may be repelled by the too-human animality of apes. Often, when he is following the growth of some primitive love-sentiment in your epoch, he is nauseated by the adored object, and by the intimacy in which he is reluctantly entangled. It is much as though a part of the mind were to watch the other part entrapped into romantic adoration of a female ape; as if with infinite disgust one were to find himself pressing against those hairy thighs. But indeed in this matter, as in others, since it is not mere animality that disgusts, but the failure to be human, the explorer is far more outraged than if he were compelled to cohabit with an ape. With familiarity, however, these repulsions can be surmounted. Just as your disgust of the ape’s approximation to the human is a weakness in you, due to lack of vision and sympathy, so our tendency to a disgust of your own crude approximation to the human is a weakness in us, which we have to learn to transform into a reverent, though often ironical, sympathy. Just as the surgeon may become accustomed to delving among viscera, and may even find beauty in them, so the explorer may and must accustom himself to all these primitive forms, and find beauty in them too. Of course the beauty which he discovers in the adored yet repulsive ape-woman is never simply identical with the beauty which delights the adoring ape-man; for it is a beauty which includes within itself both that which delights the primitive and that which disgusts the developed mind.

To all the preoccupations then, and to all the ways of life, and all the ideals, of the early races, the explorer must react with that delight which triumphs over contempt and disgust. Of course there is very much in this sphere which he can whole-heartedly enjoy, since much in primitive life is the unspoiled behaviour of the animal, and much also improves upon the animal. But at a very early stage primitive man begins to torture his own nature into grotesque forms, inadvertently or by intent; much as, inadvertently, he tortures his domestic animals, and by intent he turns his pets into freaks and caricatures. This violation of his own nature increases as he gains power, and reaches its height in primitive industrial communities such as your own. In such phases the individual body and spirit become more and more distorted, impoverished, noisome. The early explorer, studying these phases, was hard put to it to prevent his overwhelming indignation and nausea from spoiling his study. He had, of course, to observe it all as though it were happening to himself, since he observed it through the suffering minds of its victims. And so he was almost in the position of a sick doctor, whose spirit must triumph by delighting in the study of his own disease.

Grotesque sentiments such as the lust of business success or economic power of any kind, and indeed every purely self-regarding passion, from that of the social climber to that of the salvation-seeking ascetic, are experienced by the explorer with something of that shame which the child, emerging into adolescence, may feel toward the still-clinging fascination of his outgrown toys, or with such disgust as the youth may feel when he wakes from some unworthy sexual infatuation. But this shame and disgust the explorer must learn to transcend as the surgeon the disgust of blood. Even the passions of hate and gratuitous cruelty, so widespread in your own and all other primitive species, he must learn to accept with sympathy, in spite of his spontaneous revulsion from them and his well-justified moral condemnation of them.

One great difference between ourselves and most primitive minds is that, while in us all motives are fully conscious, fully open to introspection, in them scarcely any of their more complex motives are ever brought fully to light. Thus when the explorer is following some train of action in a primitive mind, he very often observes an immense discrepancy between the mind’s own view of its motives and the real motives which he himself sees to be in fact the source of the activity. To experience all the daily and hourly perversities of a life-long complex, to experience them not merely through clinical observation but in the most intimate manner, puts him to an extremely severe strain. At every turn his own mind is wrenched by the conflict in the mind that he is observing. And in him the conflict is wholly conscious and shattering. Not a few of our early observers became infected by the disorder which they had been studying, so that when they returned to their native world they could no longer behave with perfect sanity, and had to be destroyed.

To sum up, then, the earlier explorers were often desperately fatigued by the monotony of primitive existence and the sameness of primitive minds; and also they fell into disgust, an agony of disgust, with the crudity, insensitivity and folly of the primitive. From the one point of view it might be said that the Neptunian found himself condemned to sift the almost identical sand-grains of a desert, and even to record the minute distinctive features of each grain. From the other point of view, it was as though he had been banished from the adult world to the nursery or the jungle, and was actually imprisoned in the mind of babe or beast. For, once settled in the mind which he has chosen to study, the explorer is indeed a captive until study calls him elsewhere. Though he thinks his own thoughts, he perceives only what the other perceives, and is forced to endure every least sensation, thought, desire and emotion of the other, be it never so banal. Like one who feels within his own mind the beginnings of some mania or obsession which, though he recognizes that it is irrational or base, he cannot control, so the explorer is doomed to experience sympathetically all his subject’s thinking and desiring, even while he is nauseated by it. No wonder, then, that many early explorers were tortured by disgust or ennui.

Long before my time, most of these dangers and irks of exploration had been greatly reduced. One serious trouble, however, remains, and has even increased. A great army of workers was of course bred with special aptitudes for supra-temporal experience, and with special insight into the primitive types of mind. These new workers were given also a special enthusiasm and sympathy in respect of the past; and herein lay their danger. In my day every member of the race has something of this enthusiasm and sympathy; and we explorers have them in an extreme degree. So enthralling do we find the past, even in all its monotony and squalor, that many have succumbed to its spell, and lost all footing in the present world. Rapt in some great movement of history, or in some individual life-story, the explorer may lose, little by little, all memory of the future world of which he is a native, may in fact cease to be a future mind inspecting a past mind, and become instead a mere undertone or freakish propensity in the past mind itself, or in many Past minds. In time even this may vanish, so that the explorer becomes identical with the explored. If this occurs, his own body, situated in the future and in Neptune, gradually disintegrates and dies.

Certain other troubles hamper even the most modern explorers, in spite of improved technique. The method by which we enter a past epoch is, as I have said, this process of shaping our minds to the basic pattern or ground tone of the epoch to be studied. But when the explorer desires to enter a particular individual, he must try to assume the complex form or temperament which is distinctive of that individual; or else he must seize on one unique desire or thought, which he supposes to be peculiar to that individual at a certain date of his life. Now this process of mental infection or association does not necessarily work in his favour. Often, when he is trying to establish himself in some mind, or even when he has long been established, some chance association in his own thought-process may suddenly snatch him away from the object of his study and fling him into some other mind. Sometimes this other is a contemporary of the recent object of study; but often it is a mind in some different epoch or world. When this happens, not only is the study broken short, but also the explorer may be very seriously damaged. His brain, on Neptune, suffers such a fundamental and rapid readjustment that it is grievously jarred and strained, and may never recover. Even if he does not actually succumb, he may have to take a long holiday for recuperation. Fortunately, however, it is only the more extravagant dislocations that are really dangerous. Occasional jolts into minds of the same basic pattern as the original object of study are more exasperating than harmful.

Often when the explorer is resident in a particular individual he encounters through that individual’s perception another individual, who, he thinks, would repay immediate study. He has then to observe this other carefully through the perceptions of the first, so as to discover, if possible, some entry into his mind. This may be very difficult, since one primitive mind’s awareness of another is often so erroneous and biased that the perceptions which would make for true understanding of the other fail to occur. Moreover there is always the danger that, when the explorer attempts this ‘change of mounts’ he may fall between them, and be flung violently once more into his native location in time and space. Or again, he may at the critical moment be snatched by some chance association into some other epoch or world. Such accidents are of course very damaging, and may prove fatal.

Here I may mention that some minds, scattered up and down the ages, defeat all attempts to enter them. They are very rare, only one in millions of millions; but they are such as we should most desire to enter. Each one of these rare beings has caused the ruin of a great company of our most able explorers. They must be in some vital respect alien to us, so that we cannot assume their nature accurately enough to enter them. Possibly they are themselves subject to an influence future even to us. Possibly they are possessed and subtly transformed by minds native to some world in a remote stellar system. Possibly, even, they are under the direct influence of the cosmical mind, which, we hope, will awaken in the most remote of all futures.

Explorers of the past incur one other danger which I may mention. Sometimes the past individual under observation dies suddenly, before the explorer can foresee the death, and free himself. In many cases, of course, he knows the date at which the other’s death will occur, and can therefore, having prepared himself for a normal departure, observe the course of events right up to the moment of death, and yet escape before it is too late. But sometimes, especially in pioneering in some unexplored region of history, the explorer is as ignorant of the immediate future as the observed mind itself.. In such cases a dagger, a bullet, a flash of lightning, even an unforeseen heart-failure, may fling him back to his own world with a shattering jerk, which may irreparably damage his brain, or even kill him outright. Many of the early observers of your recent European War were caught in this manner. Resident in the mind of some soldier in action, the observer himself was annihilated by the shell that destroyed the observed. If burial were one of our practices, we, like you, might have our war graves of 1914 to 1918, though they would not have been dug till two thousand million years later. Nor would they be decorated by national emblems. Nor would they bear the cross.