'Mil. I'll 





iii pai t direcl l;> t«> the a n< 1 in p J l R< 



m<>\ al of this n 



heartbeat ; 1 1 1 « - heart 



skeletal muscle, Id appraising the 



noted that although by Btimulal 



heart •■an be i»i I, the <"in racti( 



it i> not rhj thmii 

 the various physiolo properl tnuscli 



if. I it \\ ill !»'• found that in all --i' thi 



muscle behaves, not li irl mus animals, but lil 



of skeletal muscle. This evidenci . while 



that the heart «'!' Limulus depends for ita rhythmic 

 boring nei ictures - not .1 the assumption that tlii> will 1"' 



• -• in the I ' animals having differenl pi 



2 The disposition <»t' the nervi uctures in tl 



the fi"L. r and turtle, I he deg 



. 



rhythmic po the diffei 



rhythmic power i^ manifested by the Minis and the 

 •ri<-lr at the IuiIIiun arteriosus. In the formi 

 structu prominent ; in the lal I 



be d< 

 In i : place, it may merelj 



atrud ■ 'I the >l«'\ elopn mic p 



The unequal rhythmic powers may depend primarily 

 iu Btructure of the muscle fibers th< 

 hown 



I 

 . loped »n an<l their i 



ular ; in Bhort, tl h-Ii more eml 



■ 



I a jury hai turn fl 



acter, it would no 



