. Electro-physiology. Electrophysiology. 308 ELECTRO-PHYSIOLOGY CHAP. paramrecia soon begin to swim about in all directions, and in a short time are once more uniformly distributed throughout the drop. This manoeuvre is repeated as often as the current is closed, with the same precision. It is easy to prove that the living state is an essential condi- tion of these phenomena by repeating the experiment after killing the animals with ether or chloroform. If unpolarisable electrodes are used with points of baked clay dipping into the infusion, instead of the excitation chamber. FIG. 99.—Galvanot
. Electro-physiology. Electrophysiology. 308 ELECTRO-PHYSIOLOGY CHAP. paramrecia soon begin to swim about in all directions, and in a short time are once more uniformly distributed throughout the drop. This manoeuvre is repeated as often as the current is closed, with the same precision. It is easy to prove that the living state is an essential condi- tion of these phenomena by repeating the experiment after killing the animals with ether or chloroform. If unpolarisable electrodes are used with points of baked clay dipping into the infusion, instead of the excitation chamber. FIG. 99.—Galvanotropism of 1'ummcucium aiifdin. (Verworn.) described above, the effects are very curious. At closure of the current all the paramsecia arrange themselves longitudinally, in accordance with the current curves, and swim along these lines towards the kathode, so that those which happen to be at the outer part of the drop follow an almost semicircular course. If the current is frequently reversed, the paranuecia may be driven now in one direction, now in the other. As may readily be understood, very rapid alternations of current do not cause them to travel in a definite direction, nor give rise to any polar accumulation. A priori there can be no doubt that in this case, as in that of Amceba, we have to do with a " galvanotropic. 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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