ADVANCED EXPERIMENTAL PHYSIOLOGY 153 



CHAPTER XXX 

 THE ACTION OF DRUGS UPON THE FROG'S HEART 



Action of Muscarine and Atropine. Dissect out the vago-sym- 

 pathetic nerve and record the effect of excitation of (1) the vago- 

 sympathetic, (2) the crescent. Next with a glass pipette apply 



