. Eight lectures on the signs of life from their electrical aspect. Electrophysiology. 84 THE SIGNS OF LIFE [lect. So that, in sum, while pointing to the conclusion that there is, as regards the external cover of an animal body, an outgoing organ-current of action, the facts forbid us to rest content in an exclusive conclusion of such simplicity, and we are obliged to admit that a cutaneous organ-current, even if it really exists by reason of a general functional and structural organisation of the integument, is twisted and obscured by other accessory and complicating conditions. Let us, howev
. Eight lectures on the signs of life from their electrical aspect. Electrophysiology. 84 THE SIGNS OF LIFE [lect. So that, in sum, while pointing to the conclusion that there is, as regards the external cover of an animal body, an outgoing organ-current of action, the facts forbid us to rest content in an exclusive conclusion of such simplicity, and we are obliged to admit that a cutaneous organ-current, even if it really exists by reason of a general functional and structural organisation of the integument, is twisted and obscured by other accessory and complicating conditions. Let us, however, imagine how things might have been. The fancy will, if nothing else, remind us of facts, and make us curious for further facts. The factsâlet me reiterate them once moreâare that the skin, when first placed on the electrodes, gives an ingoing current which increases, and that excitation of either direction gives an outgoing response which diminishes. The former is "current of rest," the latter "current of ; § 51. ^ speculation.âA lump of protoplasm, at rest and homogeneous throughout, is iso-electric throughout ; let it be VoLb â 0000- â 0025- â OOSO- '007S- â¢OJOO- '0/25-^. D., jVfilY'^ffT''^^^^^ 4 A, Fig. 38.âIndirect responses of a pad of a cat's paw to single induction shocks exciting the sciatic nerve, before and after :â D, â direct excitation of the pad by one strong break shock. Dâ = â ,, by two strong break shocks. Dg = ,, ,, by tetanisation for 5 seconds. D4 = ,, ,, by tetanisation for 15 seconds. It is somewhat surprising that direct excitation should have produced a greater diminution of the indirect response in the frog than in the cat. But in the former case the indirect response was elicited by tetanisation of the nerve, while in the case of the cat, the nerve was excited by single strong shocks. The regular effects (on the skin glands) of such stimulation are in themselves sufficiently remarkable ; their true physio
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