Briefly, the hypothesis that mind can communicate directly with mind rests on the theory that thought or vital force is a form of electrical disturbance, that it can be taken up by induction and transmitted to a distance either through a wire or simply through the all-pervading ether, as in the case of wireless telegraph waves.
"There are many analogies which suggest that thought is of the nature of an electrical disturbance. A nerve, which is of the same substance as the brain, is an excellent conductor of the electric current. When we first passed an electrical current through the nerves of a dead man we were shocked and amazed to see him sit up and move. The electrified nerves produced contraction of the muscles very much as in life.
"The nerves appear to act upon the muscles very much as the electric current acts upon an electromagnet. The current magnetizes a bar of iron placed at right angles to it, and the nerves produce, through the intangible current of vital force that flows through them, contraction of the muscular fibers that are arranged at right angles to them.
"It would be possible to cite many reasons why thought and vital force may be regarded as of the same nature as electricity. The electric current is held to be a wave motion of the ether, the hypothetical substance that fills all space and pervades all substances. We believe that there must be ether because without it the electric current could not pass through a vacuum, or sunlight through space. It is reasonable to believe that only a wave motion of a similar character can produce the phenomena of thought and vital force. We may assume that the brain cells act as a battery and that the current produced flows along the nerves.
"But does it end there? Does it not pass out of the body in waves which flow around the world unperceived by our senses, just as the wireless waves passed unperceived before Hertz and others discovered their existence?"
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