We possess a certain number of cases of kind, rigorously investigated, cases probably representing but an infinitesimal part of those which might be collected. Is it possible that they one and all elude the telepathic explanation? It would be necessary to make a study of them, conducted with the most scrupulous and unremitting attention; for the question is not devoid of interest. If the existence of ghosts were well-established, it would mean the entrance into this world, which we believe to be our world, of a new force that would explain more than one thing which we are still far from understanding. If the dead interfere at one point, there is a reason why they should not interfere at every other point. We should no longer be alone, among ourselves, in our hermetically-closed sphere, as we are perhaps only too ready to imagine it. We should have to alter more than one of our physical and moral laws, more than one of our ideas; and it would no doubt be the most important and the most extraordinary revelation that would be expected in the present state of our knowledge and since the disappearance of the old positive religions. But we are not there yet: the proof of all this is still in the nursery-stage; and I do not know if it will ever get beyond that. Nevertheless the fact remains that, in these impenetrable regions of mystery which we are now exploring, the one weak spot lies here, the one wall in which there seems to be a chink--a strange one enough--giving a glimpse into the other world. It is narrow and vague and behind it there is still darkness; but it is not without significance and we shall do well not to lose sight of it. 6