careful study and experiment comparatively only a few years, and it can hardly, at this early date, expect better treatment at the hands of its critics. Its facts, however, remain, and its explanatory theories are being duly considered. What, then, are the theories or hypotheses which may aid us in forming an idea of the manner in which a thought, a conception, or a mental picture may pass between two persons so situated that no communication could pass between them through the ordinary channels of communication--sight, hearing, or touch? Let us suppose two persons A and B to be so situated. A is the agent or person having unusual ability to impress his own thought, or any conception or mental picture which he may form in his own mind, upon some other mind; and B is the percipient or a person having unusual ability to receive or perceive such thoughts or mental pictures. Suppose these two people to be in the country and engaged in farming. Upon a certain morning A takes his axe and goes to the woods, half a mile distant, and is engaged in cutting brush and trees for the purpose of clearing the land, and B goes into the garden to care for the growing vegetables. After an hour spent in these respective occupations, B becomes disquieted, even alarmed, oppressed with the feeling that some misfortune has happened and that A is needing his assistance. He is unable to continue his work and at once starts for the woods to seek for A. He finds that A has received a glancing blow from his axe which has deeply wounded his foot, disabled him, and put his life in immediate danger from hemorrhage. Here the thought of A in his extreme peril goes out intensely to B, desiring his presence; and B, by some unusual perceptive power, takes cognizance of this intense thought and wish. This is telepathy. Again, suppose B hears a voice which he recognizes as A's calling his name and with a peculiar effect which B recognizes as distress or entreaty. Or, again, that B sees a picture or representation of A lying wounded and bleeding, still it is a telepathic impulse from A and taken cognizance of by B which constitutes the communication between them, whatever the exact nature or method of the communication may be. The theories or hypotheses which have been put forward regarding the method by which this telepathic influence or impact is conveyed may be noted as follows:-- (1) That of a vibratory medium, always present and analogous to the atmosphere for propagating sound or the universal ether for propagating light. (2) An effluence of some sort emanating from the persons concerned and acting as a medium for the time being. (3) A sixth sense. (4) A duplex personality or subliminal self.