This presumed mode of communication between one individual and another, without the intervention of any known sense, Professor Barrett, arguing on electrical analogies, is inclined to suggest might be due to some form of nervous induction. But is this faculty restricted in its operation to a hypnotised subject? If it were, the significance of the phenomena would be very much lessened. We should leave telepathy out of our account. But it is not so restricted. The ideas and images are capable of being projected not only to a hypnotised person, but to one who is apparently not under any hypnotic influence whatever. Yet we still must be careful of how we call in the aid of any "supernatural" agency to account for the influences I am about to relate--the translation of ideas and motor impulses from one person to another without the aid of any known sense. The transference of pictures which we described in the last article has been achieved in hundreds of cases by an agent upon a hypnotised percipient. Here we have telepathy apparently at work, but not, however, at any great distance, nor successful in conjuring up really vivid or ominous hallucinations. The scientific term for these is "sensory automatisms," and many instances of these are given by Edmund Gurney, author of "Phantasms of the Living." At an early period the Society for Psychical Research began a "Census of Hallucinations," which, with Gurney's book, now renders it possible for us to consider these phenomena with some certainty. The net result of all this investigation would seem to demonstrate that a large number of sensory automatisms occur amongst sane and healthy persons. We will later consider what difficulty lies in the way of attributing to telepathy the bulk of these phenomena. There is a widely accepted theory that telepathy is propagated by brain-waves, or, in Sir W. Crooke's phraseology, by ether-waves, of even smaller amplitude and greater frequency than those which carry X-rays. Such waves are supposed to pass from one brain to another, arousing in the second brain an excitation of image similar to the excitation or image from which they start in the first place. It has been pointed out that on this view there is no theoretical reason for limiting telepathy to human beings. Why may not the impulse pass between men and the lower animals, or between the lower animals themselves? I myself have exhumed from the records a case in point. General J. C. Thompson describes a remarkable apparition of a dog, with every mark of reality, at the time when the dog was killed in a city more than a hundred miles distant. General Thompson says: