62 



ELECTRO-PHYSIOLOGY 



CHAP. 



exist between the rapidly moving eye- and tongue-muscles and 

 the sluggish skeletal muscles of the chameleon. 



It must further be remarked that both the relative and 

 absolute height of twitch is much greater in the quick muscles in 

 the frog than in the sluggish muscles. A rectus abdominis 



Semimembr. jL.GracHis 



FIG. 35A. Contraction curve of three different muscles of Frog under uniform conditions. 



(Cash.) 



Hyogl. 



FIG. 35B. Four contraction curves of different muscles of Frog. (Cash.) 



Omo hyoffl. 



Vectorjnaj. 

 Jjracilis 



FIG. 35c. Four contraction curves of different muscles of Tortoise under uniform conditions. 

 The time-tracing is in seconds. 



muscle of E. esculenta, 32 mm. long, contracted about 2*6 times 

 less frequently at medium tension than the gastrocnemius, which 

 was only 28 mm. long. The height of lift recorded (enlarged) 

 amounted to 6 and 15 mm. The sluggish hyoglossus, 26 mm., 

 has, at approximately proportional tension, a height of twitch of 

 1'5 mm. only (Griitzner). 



Eollett (8) has recently pointed out a remarkable instance of 



