DIRECT ACTION ON ARTERIOLES. 



517 



o 



<4-l 



o 



^ 



Fig. 160. 



In order to exclude all centres except those in the periphery 

 Experiment XLIII was performed. 



Experiment XLIII. 



The sympathetic cord was divided on the right side of the 

 neck of a rabbit and the animal allowed to come out of the 

 chloroform anaesthesia. The ear of the right side was deeply 

 injected while the left ear was very moderately filled with 

 blood. A dose of casca was then administered. The vessels of 

 both ears became pale, those of the right eai equally so with 

 those of the other. 



Vessels Affected by the Diiug. 



The vessels by which the blood-pressure in the body is chiefly 

 regulated are those of the intestines, those of the skin and 



