In the first place then--as already explained in Chapter VI.--I in some sense fuse into one Mrs. Sidgwick's two first hypotheses by my own hypothesis of actual presence, actual spatial changes induced in the metetherial, but not in the material world. I hold that when the phantasm is discerned by more than one person at once (and on some other, but not all other occasions) it is actually effecting a change in that portion of space where it is perceived, although not, as a rule, in the matter which occupies that place. It is, therefore, not optically nor acoustically perceived; perhaps no rays of light are reflected nor waves of air set in motion; but an unknown form of supernormal perception, not necessarily acting through the sensory end-organs, comes into play. In the next place, I am inclined to lay stress on the parallel between these narratives of haunting and those phantasms of the living which I have already classed as _psychorrhagic_. In each case, as it seems to me, there is an involuntary detachment of some element of the spirit, probably with no knowledge thereof at the main centre of consciousness. Those "haunts by the living," as they may be called, where, for instance, a man is seen phantasmally standing before his own fireplace, seem to me to be repeated, perhaps more readily, after the spirit is freed from the flesh. Again, I think that the curious question as to the influence of certain _houses_ in generating apparitions may be included under the broader heading of Retrocognition. That is to say, we are not here dealing with a special condition of certain houses, but with a branch of the wide problem as to the relation of supernormal phenomena to _time_. Manifestations which occur in haunted houses depend, let us say, on something which has taken place a long time ago. In what way do they depend on that past event? Are they a sequel, or only a residue? Is there fresh operation going on, or only fresh perception of something already accomplished? Or can we in such a case draw any real distinction between a continued action and a continued perception of a past action? The closest parallel, as it seems to me, although not at first sight an obvious one, lies between these phenomena of haunting, these persistent sights and sounds, and certain phenomena of crystal-vision and of automatic script, which also seem to depend somehow upon long-past events,--to be their sequel or their residue. One specimen case I give in Appendix (VII. G), where the connection of the haunting apparition with a certain person long deceased may be maintained with more than usual plausibility. From that level the traceable connections get weaker and weaker, until we come to phantasmal scenes where there is no longer any even apparent claim to the contemporary agency of human spirits. Such a vision, for instance, as that of a line of spectral deer crossing a ford, may indeed, if seen in the same place by several independent