. Principles of the human mind, deduced from physical laws; . abundantly sup-plied to that organ. The electro-voltaic test 4 38 electro-biology; or, is best applied by the insertion of one needleinto the choroid, the second into the musclesof the eyeball, and I found a slight deflectionof the galvanometer when a strong light wasthrown into the eye, proving that vision was avoltaic phenomenon. The essential part of the organ of hearingis encased in textures of such extreme hard-ness, that it will probably be for ever pre-vented from being the subject of direct exper-iment. In the cochlea, I bel
. Principles of the human mind, deduced from physical laws; . abundantly sup-plied to that organ. The electro-voltaic test 4 38 electro-biology; or, is best applied by the insertion of one needleinto the choroid, the second into the musclesof the eyeball, and I found a slight deflectionof the galvanometer when a strong light wasthrown into the eye, proving that vision was avoltaic phenomenon. The essential part of the organ of hearingis encased in textures of such extreme hard-ness, that it will probably be for ever pre-vented from being the subject of direct exper-iment. In the cochlea, I believe we mayreasonably assume that the pitch of the noteis determined 5 and in the semicircular canalswhich are placed in the three orthogonalplanes of a cube, physiologists are pretty gen-erally agreed that animals learn the directionof sound. Blood and nerve — essentials tovoltaic action — are here distributed, and nophysical difficulty is presented to the proba-bility of a voltaic circuit being determined bysounds. THE VOLTAIC MECHANISM OF MAN. °J 39. Apparatus showing the generation of a voltaic circuit by odors. The nasal organ is, like the ear and eye,liberally supplied with blood and voltaic circuit is easily demonstrated bythe electro-voltaic test; but the animal has anextraordinary repugnance to the operation,and you must be extremely careful not to bedeceived by other secretions which are com-petent to set up the voltaic action. I can veryreadily show you that it is not at all difficultto form voltaic circuits, in which odors shouldexcite the electric action. The tube which Ihold in my hand contains two iron plates,which are separated by a membrane, and oneach side pieces of sponge, dipped in very 40 ELECTRO-BIOLOGY j OR, dilute muriatic acid, are arranged. Now, ifammoniacal vapor, which produces the mostpowerful action on the natural nose, bebrought under one side of the diaphragm,you perceive that a very strong action of theneedle is immediately
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