INVOLUNTARY MUSCLE 63 



a few drops of pituitary extract, and to another a few drops of 

 suprarenal extract, and observe the effect in both cases. 



This method is used for investigating the action of drugs upon the 

 muscular tissue of the intestine. For prolonged and exact experi- 

 ments oxygen is allowed to bubble through the Ringer so as to keep 

 the solution saturated with this gas. 



