attempt to view the internal construction of his body, and hence the sense of feeling only advises him of that which lies within his own self. This sense is abstract, not descriptive. Normal organs have no sensible existence. Thus an abnormal condition of an organ creates the sensation of pain or pleasure, but discloses nothing concerning the appearance or construction of the organ affected. The perfect liver is as vacancy. The normal brain never throbs and aches. The quiescent arm presents no evidence to the mind concerning its shape, size, or color. Man can not count his fingers unless some outside object touches them, or they press successively against each other, or he perceives them by sight. The brain of man, the seat of knowledge, in which mind centers, is not perceptible through the senses. Does it not seem irrational, however, to believe that mind itself is not aware, or could not be made cognizant, of the nature of its material surroundings?"
"I must confess that I have not given the subject a thought," I replied.
"As I predicted," he said. "It is a step toward a new idea, and simple as it seems, now that the subject has been suggested, you must agree that thousands of intelligent men have not been able to formulate the thought. The idea had never occurred to them. Even after our previous conversation concerning the possibility of showing you your own brain, you were powerless and could not conceive of the train of thought which I started, and along which I shall, now further direct your senses."
"The eye is so constituted that light produces an impression on a nervous film in the rear of that organ, this film is named the retina, the impression being carried backward therefrom through a magma of nerve fibers (the optic nerve), and reaching the brain; is recorded on that organ and thus affects the mind. Is it not rational to suppose it possible for this sequence to be reversed? In other words, if the order were reversed could not the same set of nerves carry an impression from behind to the retina, and picture thereon an image of the object which lies anterior thereto, to be again, by reflex action, carried back to the brain, thus bringing the brain substance itself to the view of the mind, and thus impress the senses? To recapitulate: If the nerve sensation, or force expression, should travel from the
