I have assumed that these phantoms coincided with no marked event. The lady may have been thinking of going to her drawing-room; the man may have been in the act of walking home;—but these are trivial circumstances which might be repeated any day.

Yet, however trivial, almost any set of human circumstances are sufficiently complex to leave room for coincidence. If the sitter in the drawing-room is wearing a distinctive article of dress, never seen by the percipient until it is seen in the hallucination;—if the phantasmal homeward traveller is carrying a parcel of unusual shape, which the real man does afterwards unexpectedly bring home with him;—there may be reason to think that there is a causal connection between the apparent agent's condition at the moment, and the apparition.

In Appendix VI. A, I quote one of these "arrival-cases," so to term them, where the peculiarity of dress was such as to make the coincidence between vision and reality well worth attention. The case is interesting also as one of our earliest examples of a psychical incident carefully recorded at the time; so that after the lapse of nearly forty years it was possible to correct the percipient's surviving recollection by his contemporary written statement.

In these arrival cases, there is, I say, a certain likelihood that the man's mind may be fixed on his return home, so that his phantasm is seen in what might seem both to himself and to others the most probable place.[110] But there are other cases where a man's phantasm is seen, in a place where there is no special reason for his appearing, although these places seem always to lie within the beat and circuit of his habitual thought.

In such cases there are still possible circumstances which may give reason to think that the apparition is causally connected with the apparent agent. The phantasm of a given person may be seen repeatedly by different percipients, or it may be seen collectively by several persons at a time; or it may combine both these evidential characteristics, and may be seen several times and by several persons together.

Now considering the rarity of phantasmal appearances, considering that not one person in (say) five thousand is ever phantasmally seen at all; the mere fact that a given person's phantasm is seen even twice, by different percipients (for we cannot count a second appearance to the same percipient as of equal value), is in itself a remarkable fact; while if this happens three or four times (as in the case of Mrs. Hawkins)[111] we can hardly ascribe such a sequence of rare occurrences to chance alone.

Again, impressive as is the repetition of the apparition in these cases, it is yet less so to my mind than the collective character of some of the perceptions. In Mrs. Hawkins's first case there were two simultaneous percipients, and in Canon Bourne's first case (given in Appendix VI. B) there were three.

And we now come to other cases, where the percipience has been collective, although it has not been repeated. There is a case[112] where two persons at one moment—a moment of no stress or excitement whatever—see the phantasm of a third; that third person being perhaps occupied with some supraliminal or subliminal thought of the scene in the midst of which she is phantasmally discerned. Both the percipients supposed at the moment that it was their actual sister whom they saw; and one can hardly fancy that a mere act of tranquil recognition of the figure by one percipient would communicate to the other percipient a telepathic shock such as would make her see the same figure as well.

The question of the true import of collectivity of percipience renews in another form that problem of invasion to which our evidence so often brings us back. When two or three persons see what seems to be the same phantom in the same place and at the same time, does that mean that that special part of space is somehow modified? or does it mean that a mental impression, conveyed by the distant agent—the phantom-begetter—to one of the percipients is reflected telepathically from that percipient's mind to the minds of the other—as it were secondary—percipients? The reader already knows that I prefer the former of these views. And I observe—as telling against that other view, of psychical contagion—that in certain collective cases we discern no probable link between any one of the percipient minds and the distant agent.

In some of that group of collective cases which we are at this moment considering, this absence of link is noticeable in a special way. There is nothing to show that any thought or emotion was passing from agent to percipients at the moment of the apparition. On the contrary, the indication is that there is no necessary connection whatever between the agent's condition of mind at the moment and the fact that such and such persons observed his phantasm. The projection of the phantasm, if I may so term it, seems a matter wholly automatic on the agent's part, as automatic and meaningless as a dream.