brain to the retina, instead of from an outward object, it will on the reverse of the retina produce the image of that which lies behind, and then if the optic nerve carry the image back to the brain, the mind will bring to the senses the appearance of the image depicted thereon."
"This is my first consideration of the subject," I replied.
"Exactly," he said; "you have passed through life looking at outside objects, and have been heedlessly ignorant of your own brain. You have never made an exclamation of surprise at the statement that you really see a star that exists in the depths of space millions of miles beyond our solar system, and yet you became incredulous and scornful when it was suggested that I could show you how you could see the configuration of your brain, an object with which the organ of sight is nearly in contact. How inconsistent."
"The chain of reasoning is certainly novel, and yet I can not think of a mode by which I can reverse my method of sight and look backward," I now respectfully answered.
"It is very simple; all that is required is a counter excitation of the nerve, and we have with us to-night what any person who cares to consider the subject can employ at any time, and thus behold an outline of a part of his own brain. I will give you the lesson."
Placing himself before the sashless window of the cabin, which opening appeared as a black space pictured against the night, the sage took the candle in his right hand, holding it so that the flame was just below the tip of the nose, and about six inches from his face. Then facing the open window he turned the pupils of his eyes upward, seeming to fix his gaze on the upper part of the open window space, and then he slowly moved the candle transversely, backward and forward, across, in front of his face, keeping it in such position that the flickering flame made a parallel line with his eyes, and as just remarked, about six inches from his face, and just below the tip of his nose. Speaking deliberately, he said:
"Now, were I you, this movement would produce a counter irritation of the retina; a rhythm of the optic nerve would follow, a reflex action of the brain accompanying, and now a figure of part of the brain that rests against the skull in the
