At my first sitting with him he described and named my mother and other relatives, whom he saw apparently with me. I had no reason to believe that he had any normal knowledge of these people; certainly I had never mentioned them to him, and it was in the last degree unlikely that anyone else had. My mother had been dead twenty-two years, and was not at all a prominent person. Moreover, he got by automatic writing a signed message from her, giving the name of the house in which we lived at the time of her death, but which we had left eleven years later. This seemed to be given by way of a test. At later sittings my father and other relatives manifested, with names and identifying detail, and the proof began to be almost coercive. The evidence went beyond any possibility of the medium's normal knowledge, and was characteristic of the different communicators in all sorts of subtle ways. Telepathy alone remained as a possible alternative to the spirit explanation. Then came a peculiar phase, as if there were a definite plan on the part of some of my friends on the other side for the purpose of utterly convincing me by bringing evidence which could not possibly be accounted for by any supposition of a reading of my own mind. A spirit friend of mine would turn up, bringing with him a spirit whom I had never heard of, and saying that he was a friend of his; and on inquiry I would find that it was so--and sometimes it needed a great deal of inquiry, which made it all the better evidence, for it showed how difficult it would have been for the medium to obtain the information; though indeed at this stage the evidence had forced me past crude suspicions of that sort. On other occasions unknown spirits would appear, and I would find that they belonged to the last visitor I had had. Several incidents of this kind are described in my book _Psychical Investigations_. After some years of this kind of experience I became fully satisfied that the spirit explanation was the only reasonable one. Some writers, like Miss Dougall in a recent volume of essays called _Immortality_, invent a complicated hypothesis according to which my mind photographs the mind of a visitor and the medium on his next visit develops and reads off the photograph; but I confess that my credulity does not stand the strain put upon it by such a hypothesis. Besides, I have lately had--as if to get round even such tortured theories as this--evidence giving details which have not been known to any person I have ever met. I was told to write to a certain friend of mine, father of the ostensible communicator. The facts were unknown even to him, but he was able to verify them completely; and they were characteristic and evidential of the identity of the ostensible communicator.