Another prolific source of error which besets the pathway of the Paris school consists in its disbelief in, and consequent disregard of, the possibility that its subjects may be possessed of clairvoyant or telepathic powers. That this frequently happens, especially in subjects of the character employed by Charcot and his coadjutors, admits of no possible doubt in the minds of those who have studied the higher phases of hypnotic science. The London Society for Psychical Research has demonstrated beyond all question the fact that telepathy is a power possessed by many; and the early mesmerists have shown conclusively that the hypnotic condition is the one of all others the most favorable for the development and exhibition of that power. This subject will be dwelt upon more at length in its proper place. It is sufficient for present purposes to remark that no line of experiments in hypnotism, in which telepathy and clairvoyance are ignored as possible factors, can be held to be demonstrative of any proposition or theory whatever. But whatever of pathological value or interest may be attached to the physical phenomena evoked by the Paris school, they certainly shed no light upon psychological science, nor do they properly belong to that domain. And just here I wish to suggest a reform in the nomenclature of the science under consideration. The word "hypnotism" was adopted by Braid at a time when he regarded himself as the discoverer of a principle which embraced the whole science of induced sleep. It is from the Greek word "hypnos," which broadly signifies sleep. But, without some qualifying word, it is too broad, inasmuch as the system to which Braid applied it is now known to be but one of many processes of inducing sleep. He imagined that he had discovered a full explanation of all psychic phenomena of the class then known as mesmeric; whereas he had only discovered the one fact that the sleep could be induced by producing an abnormal physical condition of certain nerve-centres. It was a very important discovery, for psychic science would be incomplete without it; but it does not constitute the whole science. It does, however, explain many phenomena otherwise inexplicable, and marks a line of distinction which could not otherwise be drawn. The methods of the Charcot school are essentially Braidian, and hence its results are limited largely to physical phenomena, and its conclusions necessarily pertain to physical science. The Nancy school, on the other hand, produces all its phenomena by oral suggestion, and ignores the fact that the sleep can be induced in the absence of any form of suggestion. It repudiates Braid's method of inducing it as unnecessary, and also as injurious, in that the physical disturbance of the nerve-centres unduly excites the patient. The mesmeric school differs from both the others in methods and theory, as we shall see further on.