The _definiteness_ of the details here reproduced, is all, I think, that we can reasonably desire. But most important, and I fear, most difficult to obtain, of all the qualities of our ideal telepathic experiment, is that of _reproducibility_. This is, I think, a difficulty which inheres in the very nature of the phenomenon itself. We are mainly concerned here with the powers not of the waking or empirical, but of the submerged or unconscious self. The transference of the telepathic message, though it may be helped by conscious concentration, takes place (as I hold) mainly in strata of our being which lie below the threshold of ordinary consciousness. It seems as though the influence of the _percipient's_ conscious self, at any rate, were merely hurtful to the experiment, so that to get the percipient at his best we have to catch him in a state of original innocence which he cannot long maintain. It too often has happened that so soon as his own curiosity was roused, so soon as he began to speculate on the process which was going on, and to wonder how he caught the impression, so soon did the impression cease to travel, and his unconscious self could send its message upwards no more. I am disposed to think that for the present it is to hypnotism that we must look for cases where the telepathic message can be sent repeatedly and at will. It is in the rare cases of _sommeil a distance_, or such cases as those of Mrs. Pinhey, Dr. Hericourt, and Dr. Gley, reported in Vol. II. of _Phantasms of the Living_, that there has as yet been the nearest approach to that clock-work regularity and repeatability which is the experimental ideal. It is, therefore, on the medical profession that I would urge the importance of watching for cases of this sort, which are likely to be found more frequently as the therapeutic use of hypnotism extends. I have mentioned several different forms in which these telepathic messages may be observed by careful seekers. I certainly do not assert that the power or agency operative in each of these cases is precisely the same. On the contrary, I think it probable that there are varieties and complexities quite beyond our present speculation. But at least these cases fall for us under the same primary or obvious category; they are all cases where a thought, a feeling, an impulse, a picture, has been transferred from one mind to another without the agency of the recognized organs of sense. There are some, both among friends and among opponents, who are inclined to represent telepathic experiment as a petty thing. "What does it come to," say the opponents, "even though you do get a few silly thoughts or meaningless numbers out of one head into another?" "Enough of telepathy!" say the friends; "go on to something of vaster scope!"