. Electro-physiology . FIG. ISO.—Gastrocnemius of toad. Twitches on excitation with a, obtuse tooth ; b, sharp tooth. sluggishness of toad-muscle as compared with that of the frog, or whether there are actual differences in the nerve-fibres im- plicated. In any case du Bois-Eeymond's dictum, that current excites not in virtue of its actual density, but from the rapidity of its variations, is not applicable to all locomotor apparatus. The rapidly twitching muscles of the frog correspond with the

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Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublisherlondonmacmillan