Page:Life in Motion.djvu/175

nings of the successive curves. Second, we find that at the beginning of the experiment the amount or amplitude of each contraction Fig. 66.—Consecutive tracings of the contractions of the gastrocnemius muscle of a frog, showing the effects of fatigue. Chronograph, 100 vibrations per second. Marey. slightly increases, or in other words, by successive stimulations, the muscle gets into good working trim. In the curve in the diaoram this increase is seen, as the curves at the top of the diagram are higher than those