812 



THE ENDOCRINE ORGANS, OR DUCTLESS GLANDS 



luted tubules and to constitute a renal hormone which affects the epi- 

 thelium of the kidney in a manner analogous to that by which the 

 pancreatic cells are stimulated by secretin. Another reason for believ- 





Fig. 199. Tracing showing the action of pituitrin on the uterine contractions and blood pressure 

 in a dog. Made by Barbour's method. (From Jackson.) 



ing that the secretory hormone is independent of that producing vaso- 

 dilatation of the renal vessels is the fact that a repeated dose of pituitrin, 

 although, as we have seen, usually has a depressor action on the blood 



