. Electro-physiology . FIGS. 51-53.—Muscle of Frog, indirect excitation with induction currents of increasing strength at uniform frequency (10-12 per sec.) (Grtitzner.) tively high coil frequency. With the constant current, too, it may often be observed that with repeated closure at fairly short intervals, a current ineffective in itself will gradually produce effectual excitation (Engelmann). This property of summation of stimuli characterises all irritable protoplasm (ciliated cells, nerve cells, vegetable protoplasm, Dioncea, etc.) in a more or

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Keywords: ., bo, bookcentury1800, bookdecade1890, bookpublisherlondonmacmillan