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A TEXTBOOK OF PHYSIOLOGY 



Fio. 35. CONTRACTION OF THE FROG'S HEART RECORDED BY THE SUSPENSION 



METHOD. (L. H.) 



The effect of tightening the first Stannius ligature at first gently and then firmly, 

 1 he curve should be read from right to lett. The time is marked in seconds. 



FJO. 36. RECORD OF THE CONTRACTION OF AURICLE AND VENTRICLE (TOAD) BY 

 THE USB OF CLAMP AND LEVERS. {L. H.) 



The upper tracing is the auricle, and here the contraction is represented by the down- 

 stroke. The time is marked in seconds. 



