742 



THE 11XD0CRINE ORGANS, OR DUCTLESS GLANDS 



in applying the test. To increase the sensitiveness of the muscle, the 

 artery ring should be slightly stretched by loading the lever. 

 4. The blood vessels of a frog. This method depends on the same prin- 



192. — Arrangement of apparatus for perfusion of the vessels of a brainli j. (From 



Jackson.) 



ciple as in that just described. The fluid supposed to contain epinephrine 

 is added to Locke's solution, which is meanwhile being perfused under 

 constant pressure through the blood vessels and the rate of outflow 



