Action of Tobacco Smoke 



343 



Blood - 



pressui't 



,,Mm^^^^''^^^^^ 



Till 



Fio. 4. — Cat ; ACE mixture : wrethanc. Shows the oomparative effect of pyridine, 

 collidine, and nicotine on blood -pressure. 



A, the effect of injecting into a vein 6 c.c. of 1 per cent, pyridine; B (in whicli tlie intestinal volume is also 

 recorded), the effect of injecting 6 c.c. of 1 jier cent, cullldine ; C shows the effect of 1 c.c. of 1 per cent, 

 nicotine. These tracings were obtained from different animals, Itnt may be taken for comparison. Time, 

 30 seconds. 



