LOBELINE, PILOCARPINE, ADRENALINE 



325 



adrenaline solution may be poured on the heart to ad- 

 vantage. 



Prepare to take a second record and then inject one or 

 two cubic centimeters of pilocarpine solution into the 

 heart. AVait for the drug to act as the heart may be 

 slowed or stopped and the solution may not reach the lung 

 tissues for some time. Do you get a satisfactory record! 

 How do you explain this! On what structures does pilo- 

 carpine act? Do you have any evidence that such struc- 

 tures exist in the turtle's lungs? \Vliat general conclu- 

 sions can you draw from the experiment! 



Fig. 286. Turtle lung tracing showing the action of pilocarpine. 



EXPERIMENT LXXXI. 



Lobeline, Adrenaline, Pilocarpine, Tetramethylammonium 

 chloride. (Dog: Bladder Contraction, Blood-pressure, 



Respiration, Pupil.) 



1. Arrange an eight kilo dog (the animal may be given 

 a small dose of chloretone 1.50 milligrams per kilogram 

 of weight) for recording blood-pressure, bladder contrac- 



