. Eight lectures on the signs of life from their electrical aspect. Electrophysiology. IV.] ABC 69 shock at the same strength of coil. This is a summation of effects. Moreover, if a strength of coil be taken so small as to produce no response with single shocks, tetanisation at the same strength will bring out an evident or even large positive response. Notice that, in making this experiment with tetanisa- tion, I have taken the response immediately after and not during tetanisation. A similar effect can be brought out during tetanisation, and in cases (like the present) where there is a clear
. Eight lectures on the signs of life from their electrical aspect. Electrophysiology. IV.] ABC 69 shock at the same strength of coil. This is a summation of effects. Moreover, if a strength of coil be taken so small as to produce no response with single shocks, tetanisation at the same strength will bring out an evident or even large positive response. Notice that, in making this experiment with tetanisa- tion, I have taken the response immediately after and not during tetanisation. A similar effect can be brought out during tetanisation, and in cases (like the present) where there is a clear and manifest effect in one direction, we may without fear of fallacy demonstrate that effect during as well as after tetanisation. But in doubtful cases (p. 131) there is con- siderable difficulty in distinguishing a true blaze-current from the disturbance of the galvanometer by the necessarily strong currents used, and from the relatively large polarisation currents manifested during strong tetanisation. For this reason I have deliberately abstained from laying any stress upon the effects produced during tetanisation, and have limited myself to the information obtainable with and after single shocks, and after tetanisation. § 43. The ABC plan.—With a piece of skin arranged as shown in Fig. 32, an induction current passed through the skin in the positive direc- tion from B to A has its anode at the lower surface B and its kathode at the upper surface A. A blaze- current is aroused in that same direction from B to A, and we put to ourselves the question whether that current depends upon an electro-positive state at B, or upon an electro-negative state at A, or upon both states. Or more familiarly put: is the B to A current by push of B, or by pull of A, or by both? The question will be answered by the following plan of experiment, which will enable us to examine separately the two surfaces B and A by connecting first one, then the other, with an. Fig. Please note that t
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