. Eight lectures on the signs of life from their electrical aspect . •OO3J FlG. 27.—Frog. Nerve-skin response, (l) 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 ef
. Eight lectures on the signs of life from their electrical aspect . •OO3J FlG. 27.—Frog. Nerve-skin response, (l) 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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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1903
