. Electro-physiology. Electrophysiology. 206 ELECTRO-PHYSIOLOGY CHAP. twitch had expired, as long as the closure lasted; when, 011 the other hand, it was ascending the lever returned to the abscissa completely after this twitch. By the same method of experi- ment, moreover, it is easy to establish v. Bezold's conclusions. In two experiments Engelmann found that the closure twitch began O'OOG sees, and 0'009 sees, later with an ascending than with a descending current, which must be explained by saying that in the ascending current the contraction discharged at the upper end of the muscle must
. Electro-physiology. Electrophysiology. 206 ELECTRO-PHYSIOLOGY CHAP. twitch had expired, as long as the closure lasted; when, 011 the other hand, it was ascending the lever returned to the abscissa completely after this twitch. By the same method of experi- ment, moreover, it is easy to establish v. Bezold's conclusions. In two experiments Engelmann found that the closure twitch began O'OOG sees, and 0'009 sees, later with an ascending than with a descending current, which must be explained by saying that in the ascending current the contraction discharged at the upper end of the muscle must first be transmitted through a tract of muscle 7 mm. long before it can act upon the lower movable section of the muscle. The localisation of the closing, as well as opening, persistent contraction, is elegantly shown by the. PIG. 85. following method, taken from Engelmann. The curarised sartorius is extended in Bering's double myograph, with non- polarisable electrodes, which in this case are l>otli free. In order to observe the changes of form independently in either half of the muscle, its centre is fixed by a clamp specially constructed for the purpose. This consists of two troughs, not exceeding 5 mm. in length, supported by a pillar, and covered witli a layer of oil clay (Fig. 71). The clay moulds itself firmly to the shape of the muscle, holding it sufficiently by contact alone, with no perceptible pressure, to prevent a direct transfer of the changes of form from one half of the muscle to the other, without inhibiting the transmission of the excitatory process. The non- polarisable electrodes make it possible to continue the passage. 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
