If, then, these cases must be received as authentic and true, and if they cannot be disposed of as chance coincidences, nor explained by any ordinary method or law of production or transmission, then there must be some other method of mental interaction, and mental intercommunication not usually recognized, by means of which these pictures or phantasms are produced or transferred, and this unusual method of mental interaction and intercommunication we designate telepathy. What the exact method is by which this unusual interaction is accomplished is not fully demonstrated, any more than are the methods of the various interacting forces between the sun and the planets or amongst the planets themselves. The hypothesis of a universal or inter-stellar ether has never been demonstrated; it is only a hypothesis framed because it is necessary in order to explain and support another undemonstrated theory, namely, the vibratory or wave theory of light. We do not know what the substance or force which we call attraction really is. Light has one method of movement and action, sound another, heat another, and electricity another, but most of the propositions concerning these methods of action are only theories or hypotheses having a greater or less degree of probability as the case may be. They were invented to account for certain actual and undeniable phenomena, and they are respected by all men of science or other persons having sufficient knowledge of these different subjects to entitle them to an opinion. The same thing is true of telepathy; its facts must be known and its theories well considered by those who assume to sit in judgment upon them; and when known they are respected. The Copernican theory of the planetary movements was formulated three hundred and fifty years ago; it was one hundred and fifty years later when Newton proposed the first rational theory regarding a force which might explain these motions. For this he was ridiculed and even ostracized by the self-constituted judges of his day. Telepathy has been the subject of 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.

First, then, as regards the vibratory hypothesis; it would demand a variety of media to convey separately something corresponding to the sense of sight, the sense of hearing, and to each of the other senses—touch, taste, and smell—as all these sensations have been telepathically transmitted, or else there must exist one single medium capable of transmitting these many widely different methods of sensation separately,—either of which suppositions are, to say the least, bewildering. Such a medium must also possess a power of penetrating or acting through intervening obstacles, such as no medium with which we are acquainted possesses; and, lastly, in addition to numerous apparently insurmountable difficulties and insufficiencies, there is no proof whatever that any such vibratory medium exists.

Second. Regarding a vital effluence or some physical emanation or aura belonging to each individual, and by means of which communication is possible between persons separated by too great a distance to permit communication through the ordinary channels; it is at least conceivable that such an aura or personal atmosphere exists, and by some it is claimed to be demonstrated; but admitting its existence, that it would be capable of fulfilling the numerous functions demanded of it in the premises is doubtful.

Third. That the telepathic intercommunication is accomplished by means of a sixth sense—a sort of compend of all the other senses, with added powers as regards distance and intervening obstacles—is a hypothesis which has been urged by some, and is at least intelligible; but, while it presents an intelligible explanation of such facts as clairvoyance and the hearing of voices, there is a large class of facts, as we shall see, which utterly refuse to fall into line or be explained by this hypothesis.