LOBELINE, ADRENALINE, NICOTINE, ETC. 



335 



when normal contractions again occur add some lobeline 

 solution to the beaker. Explain the results. If a contrac- 

 tion is produced counteract this by adding adrenaline to 

 the beaker. Repeat this process with nicotine and pilo- 

 carpine. (It may be necessary to use a fresh ring of in- 



Fig. 293. Tracing showing the action of muscarine on intestinal contractions, respiration 



and blood-pressure in a dog. 



