"Were I now introducing for the first time these inquiries to the world of science, I should choose a starting point different from that of old (where we formerly began). It would be well to begin with Telepathy; with that fundamental law, as I believe it to be, that thoughts and images may be transferred from one mind to another without the agency of the recognized organs of sense--that knowledge may enter the human mind without being communicated in any hitherto known or recognized ways. * * * If telepathy takes place, we have two physical facts--the physical change in the brain of A, the suggestor, and the analogous physical change in the brain of B, the recipient of the suggestion. Between these two physical events there must exist a train of physical causes. * * * It is unscientific to call in the aid of mysterious agencies, when with every fresh advance in knowledge it is shown that either vibrations have powers and attributes abundantly able to any demand--even the transmission of thought. "It is supposed by some physiologists that the essential cells of nerves do not actually touch, but are separated by a narrow gap which widens in sleep while it narrows almost to extinction during mental activity. This condition is so singularly like a Branly or Lodge coherer (a device which led to the discovery of wireless telegraphy) as to suggest a further analogy. The structure of brain and nerve being similar, it is conceivable that there may be present masses of such nerve coherers in the brain, whose special function it may be to receive impulses brought from without, through the connecting sequence of ether waves of appropriate order of magnitude. "Roentgen has familiarized us with an order of vibrations of extreme minuteness as compared with the smallest waves with which we have hitherto been acquainted: and there is no reason to suppose that we have here reached the limit of frequency. It is known that the action of thought is accompanied by certain molecular movements in the brain, and here we have physical vibrations capable from their extreme minuteness of acting direct upon individual molecules, while their rapidity approaches that of internal and external movements of the atoms themselves. A formidable range of phenomena must be scientifically sifted before we effectually grasp a faculty so strange, so bewildering, and for ages so inscrutable, as the direct action of mind upon mind.