ELEMENTAKY EXPEKIMENTAL PHYSIOLOGY ; /,101 



43' 



53' 



FIG. 96. Contraction of the frog s heart recorded by the suspension method. Effect 

 of pouring over the heart normal saline at the temperatures indicated. The water 

 cools rapidly when this method is used, and the heart is not heated throughout its 

 mass to the temperature indicated. (Pembrey and Phillips.) 



