THOUGHT : CREATIVE AND EXHAUSTIVE: Page 138

against a wall. The ball returns to your hand with exactly the same force which drove it through space to the wall. This is very simple. The human brain may fitly be compared to a galvanic battery, generating currents of electric force, weak or strong, according to the nature of its structure and power. We generate a thought-current, bring it up to a high pitch of vibration, project it over our nerves and then off at the extremities,-into physical manifestation ; an act, a word, or something else. That is how I understand it. The brain, which is a concentration of fine nerve matter, commanding an area of upwards of 300 square inches, when stimulated by a thought, generates force in the brain-cells, which number about 250,000 to the square inch; and currents of this force run down the nerves, which in turn are attached to these cells-the "brain" battery cells, we may well call them. Indeed physiology teaches us that attached to each cell are nerves, never less than two in number and sometimes as many as four. Minute nerve fibres proceed in bundles and cords from the microscopical centres, the cells-I mean,-all over the physique. These fibres are very fine, I may say, superfine, in structure, since their ultimate ends are not perceptible even under the lenses of a microscope. You may imagine how fine they are when I tell you that the smallest part of them, the microscopically visible part, "is calculated to measure in size not more than 1-15,000 part of an inch/' and it is consid-