98 



The Endocrine Organs 



by Herring, who finds well-marked differences of effect according as 

 extracts are prepared from pars intermedia or pars nervosa. 1 Thus pars 



FIG. 68. Effects on blood-pressure and kidney volume of injecting 3 c.c. of a 2 per cent, extract 

 of pars intermedia of fresh ox pituitary into the jugular vein of a cat. (Herring.) 



a, blood-pressure ; l>, kidney volume ; c, urine drops ; d, signal ; e, time in ten-second intervals. 



a 



WWWWiAM/, f 



FIG. 69. Effects on blood-pressure and kidney volume of injecting 3 c.c. of a 2 per cent, extract 

 of pars nervosa of fresh ox pituitary into the jugular vein of the same cat. This injection 

 was made eight minutes later. (Herring.) Lettering as in fig. 68. 



nervosa of the ox excites the uterine muscle much more powerfully than 

 does pars intermedia, whilst pars intermedia excites both uterine muscle 

 and mammary gland more easily than it excites the plain muscular tissue 



1 Most workers have employed extracts of the whole posterior lobe, which contains 

 both parts. 



