Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect eightlectureson00wall Year: 1903 voLt ooi becand. Fig. 27.—Frog. Nerve-skin response. (i) Positive or outgoing. (2) Mixed. (3) Negative or ingoing. § 39. Latent period.—Here are a couple of photographic records, taken on a more rapidly travelling plate, in order to bring out more distinctly what was already obvious to simple * The accounts given by previous observers—by Engelmann and by Hermann in particular—are not quite easy to reconcile -with each other, and with the description given in the text
Eight lectures on the signs Eight lectures on the signs of life from their electrical aspect eightlectureson00wall Year: 1903 voLt ooi becand. Fig. 27.—Frog. Nerve-skin response. (i) Positive or outgoing. (2) Mixed. (3) Negative or ingoing. § 39. Latent period.—Here are a couple of photographic records, taken on a more rapidly travelling plate, in order to bring out more distinctly what was already obvious to simple * The accounts given by previous observers—by Engelmann and by Hermann in particular—are not quite easy to reconcile -with each other, and with the description given in the text of these lectures. Thus Engelmann, in 1872, concluded that the usual effect of indirect excitation is a ' negative varia- tion' of the normal (ingoing) current Hermann, in 1878, gives the usual and principal effect as being a 'positive variation' of the normal current. The two accounts are summarised in the following diagram, and their
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