TETRAMETHYLAMMOXIUM CHLORIDE 



329 



Fig. 289. Blood-pressure (and kidney volume) tracing showing the action of 

 tetramethylammonium chloride before and after the injection of atropine. The first 

 dose of tetramethylammonium chloride caused a great fall in pressure because the vagus 

 endings in the heart were intact. The second dose, however, following paralysis of the 

 vagus endings by atropine, caused a great rise in pressure. The kidney volume also 

 actii'dv shrinks. To what is this action due? 



