PLATE V 



FIG. i. Section of the duodenum of the cat, injected, X 20. Author's collection. 



The upper part of this section shows the distribution of the bloodvessels in the villi ; im- 

 mediately below the villi are the follicles of Lieberkiihn, not defined by reason of the low 

 magnification ; beneath these are glands of Brunner (not well defined), surrounded with plex- 

 uses of capillaries ; the bottom of the figure shows the peculiar distribution of bloodvessels in 

 the muscular coat. 



FIG. 2. Section of the small intestine of the rat, injected, x 20. Author's collection. 



This figure shows the distribution of bloodvessels in the villi of the rat, the form of the 

 villi being quite different from the form of these structures in the cat. 



FIG. 3. Bloodvessels of the pancreas of the cat, injected, x 30. Author's collection. 



This figure shows arterioles breaking up into several plexuses of capillaries surrounding 

 lobules of the pancreas. 



FIG. 4. Section of the human pancreas (hematoxylin-eosiri), x 125. Ewing. 



Just above the centre of this figure, is a collection of centro-acinar cells forming an island of 

 Langerhans ; the rest of the figure is filled with the ordinary secreting cells of the pancreas ; 

 the outer and inner zones of the cells are shown, but not very distinctly, on account of the 

 low magnification. 



FIG. 5. Section of the large intestine of the dog (hematoxylin-eosin), x 20. Author's 

 collection. 



This figure shows the follicles of Lieberkiihn which are larger than in the small intestine 

 both in long section and in cross-section ; a solitary gland is in the centre of the figure, lying 

 in the submucous connective tissue ; the lowest part of the figure shows a section of the muscular 

 coat, deeply stained ; the connective tissue is stained red. 



FIG. 6. Section of an active human breast (hematoxylin-eosin), x 125. Ewing. 



This figure shows a portion of a lobule, the secreting cells presenting nuclei deeply 

 stained ; a portion of a duct is shown at the lower part of the figure. 



