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EXPERIMENTAL PH YSIOLOG Y 



Fig. 104. — Tracing i Shows the Effect of Applying a Weak Solution of 

 Nicotine Directly to the Heart. The Short Vertical Mark Indicates 

 the Instant at which it was applied ; n Gives the Result of Stimulation 

 of the Vagus ; in of Stimulation of the Crescent ; and iv of Stimulation 

 of the Crescent after a Further Dose of Nicotine had been Applied. 

 Time Tracing Seconds. Magnification, 5. 



