II 



CHANGE OF FORM IN MUSCLE DURING ACTIVITY 



crement. The curve of fatigue, i.e. the line connecting the 



A 



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B 



FIG. 43. A, Twitches of a non-curarised Frog's gastrocnemius with normal circulation. To show 

 acceleration of fatigue with increased frequency of stimulation. Tuning-fork, ^ sec. (Engel- 

 mann.) B, Series of contractions of flexor muscles of finger, artificially excited. The load 

 (1 kgr.) was carried till the ringer became exhausted. (Mosso.) 



