THE CARDIAC NERVES 



175 



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FIG. 80. SHOWS EFFECT OF STIMULATION OF VAGUS (A) AND OF ACCELERATOR 

 NERVES (B) IN CAT'S HEART WITH A.-V.' BUNDLE CUT. (W. Cullis and E. M. 

 Tribe.) 



The vagus effect is abolished, but the action of the accelerators persists, especially the 



augmentor effect. 



Fia. 81. SHOWS THE EFFECT OF A SMALL INJECTION OF MUSCARINE UPON THE DOG'S 

 HEART (VENTRICLE UPP^R, AURICLE LOWER TRACING). (Dixon.) 



The auricla was completely inhibited in diastole. At B atropine was injected into a 

 vein, and the inhibitory effects passed off. 



