. Electro-physiology. Electrophysiology. 392 ELECTRO-PHYSIOLOGY CHAP. causes an effect in the direction of an ascending current in the arm, which, according to the later measurements of Hermann, has a very low potential (0'0014 — 0'0023 Dan.) An analogous result is obtained on leading off from both feet. In order that the experiment may succeed it is essential that the voluntary muscular action should be as vigorous as possible. Du Bois-Eeymond strained his arm until " the muscles appeared as hard as boards, the arm shook violently, and after some seconds a lively sensation of warmth was
. Electro-physiology. Electrophysiology. 392 ELECTRO-PHYSIOLOGY CHAP. causes an effect in the direction of an ascending current in the arm, which, according to the later measurements of Hermann, has a very low potential (0'0014 — 0'0023 Dan.) An analogous result is obtained on leading off from both feet. In order that the experiment may succeed it is essential that the voluntary muscular action should be as vigorous as possible. Du Bois-Eeymond strained his arm until " the muscles appeared as hard as boards, the arm shook violently, and after some seconds a lively sensation of warmth was ; Sometimes, as. Fia. 124.—Du Bois' "voluntary ; (Du Bois-Reymond.) proposed by Mousson, a battery was formed by the co-operation of several persons, a vessel of concentrated salt solution being placed between two, into which each person dipped a finger, and simultaneously stretched one arm (on the same side). All these galvanic manifestations were characterised by a long after-effect, as well as by inability to evoke secondary excitation in the physiological rheoscope, to which we shall return later. This fact in itself is in no way prejudicial to du Bois-Eeymond's dictum that the effect under discussion is the expression of the negative variation of the muscle current in the human limb. On the other hand, various other considerations have been. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Biedermann, W. (Wilhelm), 1852-1929; Welby, Frances A. (Frances Alice). London : Macmillan
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublisherlondonmacmillan
