mivsiouxiY 



TIII' 



UI,ANI>S 



11 u la lie r hormone, much doubt existed as to the correctness of Pavlov's 

 claim. As ill many oilier fields of physiological science, investigators at- 

 tempted to show that one or the other mechanism obtained, and they were 

 n of inclined to consider the possibility that both mechanisms might exist 

 side by side. That such is the case, however, is clear from the most recent 

 work, in which it has been found that if proper precautions are taken, 

 repeated stiTrmlntinn -nf t.hn irnqnn nevvfl flnna nn.11 fnyfhftafirrftfiny> of 



pancreatic juice which, besides being less copious thantKaT following 



ii. 



in. 



!''>:. 147. Three preparations of pancreatic acini stained by eosin orange tolni.lm i.iuo. The 

 I'-ini of Fig. I were from a gland after vagus stimulation, and it is noted that besides free ex- 

 trusion of the granules, globules staining with orange (and appearing in deep black in the photo- 



iraph) have formed and may be present in the ductules. Some 



in Iheir sl.mnm: properties, !>eeonuii>; li-hl led (d.uk >M.I\ in photo>;r, 



wen i loin danda excited by secretin. No globules appear; the gram 

 M'l" 11 in the clear protoplasm. (Prom llabkin, Rubaschktn and Ssa 



I he globules. Innvev 

 I-1O. The .leini in I I 



secret in injection, differs from it in the important fact that it contains 

 not t.rypsinogen but activejCTisin. Since the normal pancreatic juice 

 contains trypsino^cn, this last mentioned fact would appear to indicate 



that \ a^'iis cont rol of Ihe normal secretion can not he an important affair. 



The vjiirns secretion of pancreatic juice is, moreover, paralyzed by atro- 

 pine, which has no action on the secretin mechanism (cf. Bayliss). 



