. Eight lectures on the signs of life from their electrical aspect. Electrophysiology. ABC with the galvanometer. There is a large deflection to your right, indicating current in the skin from C to A, , that A has been rendered electro-negative to C, an unaltered point, and to other unaltered points inclusive of B, which by the previous trial you saw to be unaltered. We infer from this first pair of trials that the outgoing (unequivocal) blaze B A depends upon post-kathodic " pull" under A at or near the outer surface. Now reverse the direction of excitation, passing the inductio
. Eight lectures on the signs of life from their electrical aspect. Electrophysiology. ABC with the galvanometer. There is a large deflection to your right, indicating current in the skin from C to A, , that A has been rendered electro-negative to C, an unaltered point, and to other unaltered points inclusive of B, which by the previous trial you saw to be unaltered. We infer from this first pair of trials that the outgoing (unequivocal) blaze B A depends upon post-kathodic " pull" under A at or near the outer surface. Now reverse the direction of excitation, passing the induction shock through the skin in the negative direction from A to B. First test the altered state of B, in the same way as before (balance B with C, excite through A B, connect B C with the galvanometer), there is no effect. Then test the altered state of A (balance A C, excite A B, connect A C), there is a large deflec- tion to your right, , current in the skin from C to A, , A is electro-negative to unaltered points C and B, etc. We infer from this second pair of trials, that the outgoing (equivocal) blaze B A depends upon post-anodic " pull" under A at or near the external surface. And from both pairs of trials we infer the simple conclusion that the blaze-currents B A—unequivocal by excitation B A and equivocal by excitation A B—depend upon an electro-motive action aroused at or near the external surface. We must further infer, against all our preconceptions of the matter, that this electro-motive action is aroused by the kathode as well as by the anode of an exciting current (, is post- kathodic as well as post-anodic) and that in both cases it consists in an electro-negative state of the active part, , that this part is galvanometri- cally positive to inactive parts—the seat of an in- creased anionic solution- pressure. § 44. Intact external surface.—We shall find in this ABC plan a ready means of testing an intact external surface, and of th
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