THE PITUITARY BODY 



less after an intra-arterial injection (1/60 and 2/5 respective- 

 ly) than after an intravenous injection. These results seemed 

 to indicate that the pressor principle, by passage through the 

 tissues, is destroyed to a greater extent than the oxytocic 

 principle. However, Hartmann (1930) did not observe such 

 a striking reduction in the pressor effect of an extract after 

 injection into the femoral artery (also used in Knaus's experi- 

 ments) or the splenic vein. He did not investigate the 

 oxytocic effect. Both authors used cats. 



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