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Fig. 62.—The frog-heart apparatus, as devised by Professor Kronecker of Berne. g, the heart fixed on the end of a tube which has two branches. One branch, to the left, 'd, communicates with a stop-cock, a, by which the heart can be fed with blood either from the tube c or b. The other limb of the tube, to the right, passes to a small manometer containing mercury. On the longer limb of the manometer is a little glass rod, e f. When the heart beats, it cannot force the blood back to the tube b by d, because the stop-cock a is shut. It presses on the mercury in the manometer and raises e f.
