Effects of Extracts of Posterior Lobe of Pituitary 85 



(Noel Paton and Watson). Moreover, while adrenalin either produces no 

 action on the coronary vessels or, in some cases, causes them to dilate, 



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the autacoid of the pituitary constricts them as it does most other systemic 

 arterioles ; this is true also for the pulmonary vessels. The pressor 

 hormone also has the peculiarity that the effect of a second dose admini- 

 stered a short interval (thirty minutes or less) after the first usually causes 



