ACTION OF NICOTINE 



309 



nicotine. How does this record compare with your first 



one? What is the action of nicotine on the heart muscle? 



Stimulate the vagi from time to time and note any change 



in reaction. When an inhibition of the heart can no longer 



Fig. 272. Tracing showing the action of nicotine on the spleen volume, blood-pres- 

 and respiration in a dog (etherized). Compare this record with one made by ad- 



sure and respiration 

 renaline (or confine). 



be obtained (inject more nicotine if necessary] then empty 

 out the nicotine and fill the burette with pilocarpine solu- 

 tion (one cubic centimeter equals one milligram). 



Inject one cubic centimeter of pilocarpine. Wait for the 



