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. If all my results were of the kind I have had through Mr Wilkinson the case would, for me, be so utterly and overwhelmingly proved that doubt would be absurd. But this is too much to expect. I have had many other mediums here, with varying success, but nothing approaching Mr Wilkinson's. In many cases it is fairly obvious that the medium's subliminal--or the control's imagination--has been doing part of the business, no doubt unknown to the medium's normal consciousness. But in no case have I had any indication of fraud. This seems sufficient answer to Mr Edward Clodd's credulous acceptance of the theory of a Blue-Book and inquiry system which enables mediums to post themselves up about likely sitters. It would be the easiest thing in the world for an imitation medium to learn enough about me to give what would seem on the face of it a fairly "good" sitting. But this is never the case. Either the medium fails or he is so successful that normal knowledge is ruled out. On Mr Clodd's theory, I ought to have neither of these extremes; I ought to have no failures, and no results going beyond what inquiry could produce. But I need not labour this point, for Mr Clodd has recently confessed his almost absurd innocence of any first-hand experience. In a letter to the _International Psychic Gazette_ for April, 1918, he said he had been to a sitting about fifty years ago, but he does not remember much about what happened! Yet he sets up as an authority on this branch of experimental science! It is like someone writing on chemistry after being in a laboratory once, fifty years ago.