294 LABOR A TOR Y G VIDE IN PH YSIOLOG Y. 



() How does it affect an animal poisoned by pilocar- 

 pin? 



(/) Could pilocarpin alter the effect produced by 

 severing the vagi if it acted on the proximal side of 

 the point at which the vagi were cut? On a point 

 beyond that at which they were cut? 



(//) Could the pilocarpin alter the effect normally 

 produced by severing the vagi, by acting on the 

 cardiac sympathetic? 



(<?) Enumerate the possible points at which pilocar- 

 pin may act to produce the effects observed. 



(4) Give to the same dog 5 mgrms. atropin, hypoder- 

 mically. 



(a) Is the rate of heart-beat altered ? 



() Where does atropin act to produce alteration in 



rate of heart-beat (see atropin.) 

 (c) Does atropin antagonize the action of pilocarpin 



in this experiment? 

 (</) To what elements have you limited the probable 



action of pilocarpin ? 



(5) General observations. 



(0) Compare the action of pilocarpin with that of 

 atropin, throughout the range of action observed. 



(<) Is atropin a physiological antagonist to pilo- 

 carpin ? 



