. The electromotive properties of the skin of the common eel. crochet cotton contacts soaked in physio-logical salt solution. The galvanometer (Elliott, 20,000 ohms R.) was arranged withthe usual compensating circuit supplied with a Daniell cell of very low resistance. The general plan of circuit is evident from the wood-cut, fig. 1. By means of a paraffin switch, C, it was possible to stimulate the skm by thecurrent of the secondary coil, S, through the electrodes, with the galvanometercircuit broken, and immediately, by turning over the key, to turn the skin currentinto the compensating circ
. The electromotive properties of the skin of the common eel. crochet cotton contacts soaked in physio-logical salt solution. The galvanometer (Elliott, 20,000 ohms R.) was arranged withthe usual compensating circuit supplied with a Daniell cell of very low resistance. The general plan of circuit is evident from the wood-cut, fig. 1. By means of a paraffin switch, C, it was possible to stimulate the skm by thecurrent of the secondary coil, S, through the electrodes, with the galvanometercircuit broken, and immediately, by turning over the key, to turn the skin currentinto the compensating circuit. The reverser, R, was introduced for purposes oftesting for possible polarisation of electrodes, but with the strengths of stimulatingcurrent employed this was not found to occur. The moist chamber was furthermore MDCCCXCIIL—B. 2 X 338 PROFESSOR E. W. REID ON THE ELECTROMOTIVE provided with an inlet and outlet tube, so that gases or vapours could easily beintroduced and subsequently removed without any disturbance of the electricalcontacts. Fig. 1. D. The Electroinodve Force and Direction of the Current of Rest. [Hermann quotes 003 — 0070 for the value of the of the current of restof the Eels skin, while Bayliss and Bradford (14) give 00569 volt for one case. Inthe course of these experiments I have observed variations from 00072 — regards the direction of the current, both Hermann and Bayliss and Bradfordfound it to be ingoing. Though this is the rule, and is always the final result, yet itis iiot uncommon to find an outgoing current indicative of inner surface negative toouter immediately after setting up the preparation. With time the direction of thisabnormal current reverses to the normal. Even if the current is in the normaldirection at the first, its generally continues to rise for some time. Theconditions that favour the presence of an abnormally directed current of rest are;(i.) the examination of pieces of exsected skin immediately af
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