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EXPERIMENTAL PHARMACOLOGY 



one milligram dog) and thus counteract the eserine ac- 

 tion. How does the bladder respond to these drugs? 



If the animal is still in a suitable condition inject five 

 cubic centimeters of heroine or other (phenanthrene) de- 

 rivative of opium (dose for an eight kilo dog) and see if 



Fig. 300. Tracing showing the action of heroine and adrenaline on the bronchioles and 

 blood-pressure in a spinal dog. Made by aspiration of the chest. 



you can get a bronchoconstriction or a bladder contrac- 



v o 



tion after atropine. Counteract this with adrenaline (one 

 and one-half cubic centimeters dog). 



How does eserine affect the respiration in a normal ani- 



