Extravagant as such a profession sounds, it has a meaning which we shall do well to note. These resolute antagonists mean that no new evidence can carry conviction to them unless it be continuous with old evidence; and that they cannot conceive that evidence to a world of spirit can possibly be continuous with evidence based upon our experience of a world of matter. I agree with this demand for continuity; and I agree also that the claims usually advanced for a spiritual world have not only made no attempt at continuity with known fact, but have even ostentatiously thrown such continuity to the winds. The popular mind has expressly desired something startling, something outside Law and above Nature. It has loved, if not a Credo quia absurdum, at least a Credo quia non probatum. But the inevitable retribution is a deep insecurity in the conviction thus attained. Unsupported by the general fabric of knowledge, the act of faith seems to shrink into the background as that great fabric stands and grows.
I can hardly too often repeat that my object in these pages is of a quite opposite character. Believing that all cognisable Mind is as continuous as all cognisable Matter, my ideal would be to attempt for the realm of mind what the spectroscope and the law of gravitation have effected for the realm of matter, and to carry that known cosmic uniformity of substance and interaction upwards among the essences and operations of an unknown spiritual world. And in order to explore these unreachable altitudes I would not ask to stand with the theologian on the summit of a "cloud-capt tower," but rather on plain earth at the measured base of a trigonometrical survey.
If we would measure such a base, the jungle must be cleared to begin with. Let us move for a while among first definitions; trying to make clear to ourselves what kind of thing it is that we are endeavouring to trace or discover. In popular parlance, we are looking out for ghosts. What connotation, then, are we to give to the word "ghost"—a word which has embodied so many unfounded theories and causeless fears? It would be more satisfactory, in the present state of our knowledge, simply to collect facts without offering speculative comment. But it seems safer to begin by briefly pointing out the manifest errors of the traditional view; since that tradition, if left unnoticed, would remain lodged in the background even of many minds which have never really accepted it.
Briefly, then, the popular view regards a "ghost" as a deceased person permitted by Providence to hold communication with survivors. And this short definition contains, I think, at least three unwarrantable assumptions.
In the first place, such words as permission and Providence are simply neither more nor less applicable to this phenomenon than to any other. We conceive that all phenomena alike take place in accordance with the laws of the universe, and consequently by permission of the Supreme Power in the universe. Undoubtedly the phenomena with which we are dealing are in this sense permitted to occur. But there is no a priori reason whatever for assuming that they are permitted in any especial sense of their own, or that they form exceptions to law, instead of being exemplifications of law. Nor is there any a posteriori reason for supposing any such inference to be deducible from a study of the phenomena themselves. If we attempt to find in these phenomena any poetical justice or manifest adaptation to human cravings, we shall be just as much disappointed as if we endeavoured to find a similar satisfaction in the ordinary course of terrene history.
In the second place, we have no warrant for the assumption that the phantom seen, even though it be somehow caused by a deceased person, is that deceased person, in any ordinary sense of the word. Instead of appealing to the crude analogy of the living friend who, when he has walked into the room, is in the room, we shall find for the ghost a much closer parallel in those hallucinatory figures or phantasms which living persons can sometimes project at a distance.
But experience shows that when—as with these post-mortem phantoms—the deceased person has gone well out of sight or reach there is a tendency, so to say, to anthropomorphose the apparition; to suppose that, as the deceased person is not provably anywhere else, he is probably here; and that the apparition is bound to behave accordingly. All such assumptions must be dismissed, and the phantom must be taken on its merits, as indicating merely a certain connection with the deceased, the precise nature of that connection being a part of the problem to be solved.
And in the third place, just as we must cease to say that the phantom is the deceased, so also must we cease to ascribe to the phantom the motives by which we imagine that the deceased might be swayed. We must therefore exclude from our definition of a ghost any words which assume its intention to communicate with the living. It may bear such a relation to the deceased that it can reflect or represent his presumed wish to communicate, or it may not. If, for instance, its relation to his post-mortem life be like the relation of my dreams to my earthly life, it may represent little that is truly his, save such vague memories and instincts as give a dim individuality to each man's trivial dreams.
Let us attempt, then, a truer definition. Instead of describing a "ghost" as a dead person permitted to communicate with the living, let us define it as a manifestation of persistent personal energy, or as an indication that some kind of force is being exercised after death which is in some way connected with a person previously known on earth. In this definition we have eliminated, as will be seen, a great mass of popular assumptions. Yet we must introduce a further proviso, lest our definition still seem to imply an assumption which we have no right to make. It is theoretically possible that this force or influence, which after a man's death creates a phantasmal impression of him, may indicate no continuing action on his part, but may be some residue of the force or energy which he generated while yet alive. There may be veridical after-images—such as Gurney hints at (Proceedings S.P.R., vol. v. p. 417) when in his comments on the recurring figure of an old woman—seen on the bed where she was murdered—he remarks that this figure suggests not so much "any continuing local interest on the part of the deceased person, as the survival of a mere image, impressed, we cannot guess how, on we cannot guess what, by that person's physical organism, and perceptible at times to those endowed with some cognate form of sensitiveness."
Strange as this notion may seem, it is strongly suggested by many of the cases of haunting which do not fall within the scope of the present chapter. We shall presently find that there is strong evidence for the recurrence of the same hallucinatory figures in the same localities, but weak evidence to indicate any purpose in most of these figures, or any connection with bygone individuals, or with such tragedies as are popularly supposed to start a ghost on its career. In some of these cases of frequent, meaningless recurrence of a figure in a given spot, we are driven to wonder whether it can be some deceased person's past frequentation of that spot, rather than any fresh action of his after death, which has generated what I have termed the veridical after-image—veridical in the sense that it communicates information, previously unknown to the percipient, as to a former inhabitant of the haunted locality.