Valentine's sanity, was now under the baneful influence of his insanity. The doctor had gone the length of deciding, in his own mind, that Valentine's sane period of life and insane period lay one on each side of a fixed gulf, and that fixed gulf was his long trance succeeding the final sitting of the two young men. This conclusion was arrived at with ease, once the theory of a subtle lunacy was accepted as a fact. For, on sending his mind back along the ways of recollection, the doctor was able to recall hints of the new Valentine dating from that very night, but never before it. The first hint was Rip's manifested fear, and this led on to others which have been already mentioned. Having made up his mind that this trance was the motive power of Valentine's supposed madness, the doctor sought in every direction to increase his knowledge on the subject of simulations of death by the human body. He looked up again the cases of innumerable hysterical patients whom he had himself treated, sometimes with success, sometimes with failure. He consulted other doctors, of course without mentioning the object of his research. He endeavoured to apply to Valentine's case standards by which he was quickly able to form a satisfactory opinion on the cases of others. He even went so far as to examine as closely as possible into the history of table-turning, the uses ascribed to it by its votaries, and the results obtained from it by credible--as opposed to merely credulous--witnesses. But he found no case that seemed in any way analogous to the strange case of Valentine. As was only natural, the doctor did not forget the possibility of hypnotism, which had struck him during his second conversation with the lady of the feathers. Her confused declarations on the subject of Valentine and Marr being one person, if they were really a true account of what Valentine had said to her--which seemed very doubtful--could only be made clear by accepting as a fact that the dead Marr had laid a hypnotic spell upon Valentine, which continued to exist actively long after its weaver slept in the grave. But Marr and Valentine had never met. This fact seemed fully established. Valentine had always denied any knowledge of him before the trance. Julian had always assumed that only he of the two friends had any acquaintance with Marr. And again, when the doctor, one day, quite casually, said to Valentine, "By the way, you never did meet Marr, did you?" Valentine replied, "Never, till I saw him lying dead in the Euston Road."