264 



'NIK CIRCULATION OF THE BLOOD 



eie*' 1 



t/u<a* 



\pjjjko**A£jcL 



A. — Normal 



B. — Apex cooled 



C. — Apex wanned 



Fig. 84. — Records of electrocardiogram and movement of ventricle of frog showing that when 

 the apex is warmed a typical T-wave appears in place of a wave in the opposite direction appear- 

 ing when the apex is cooled. (From Mines.) 



