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EXPERIMENTAL PHARMACOLOGY 



the results. (See Fig. 312.) AYhat structures are involved 

 and how are they affected ? 



As soon as you get one good tracing from the ergamine 

 then empty it out and nil the burette (or connect a third 



Fig. 312. Tracing showing the action of ergamine (histamine. /3-iminazolylethylamine) 

 and hordenine on the bronchioles and blood-pressure in a spinal dog. Curara had been 

 given. 



burette to an external jugular vein) with atropine solution 

 (one cubic centimeter equals one milligram). Start the 

 drum and inject one cubic centimeter of the atropine. Then 

 stimulate the vagus nerves and see if the bronchioles or 



