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EXPERIMENTAL PHARMACOLOGY 



and pupils are affected. Is the respiration changed by the 

 stimulation ? Have any of these phenomena been influenced 

 in any way by the drugs If so, what anatomical struc- 

 tures were involved and how were they affected? Are 

 these structures ever involved in pathological conditions 



Fig. 290. Tracing showing the action of tetramethylammonium chloride on the blood- 

 pressure and bladder contractions in a dog which had previously received a dose of 

 atropine. Animal anesthetized by nitrous oxide. 



such as typhoid fever or pneumonia? What symptoms 

 would these reactions probably produce in a non-anesthe- 

 tized animal? 



If the animal is still in suitable condition empty out the 

 pilocarpine and fill the burette with a solution (one cubic 



