398 INTERNAL SECRETIONS OF PANCREAS AND SPLEEN. 



glomerulus of tortuous, freely-anastomosing vessels, much 

 thicker than those between the acini. A single afferent ves- 

 sel like that of the glomerulus of the kidney does not enter 

 this group of dilated capillaries, hut numerous anastomoses 

 make it continuous with the interacinar capillaries. When 

 Berlin blue is injected through the aorta into the arteries of 

 the pancreas, it not infrequently happens that in portions of 

 the gland which are poorly injected the vessels of the island 



CAMERA-LUCIDA TRACING OP THE LOBULE BOUNDARIES IN 

 ONE OP A SERIES OP SECTIONS FROM THE SPLENIC END OP A 

 CAT'S PANCREAS. 



The majority of the lobules are well defined. Those marked d, 

 e, f, g, and h are poorly outlined, but are found to be more readily 

 distinguishable when traced through the series of secretions. The 

 lobules, which are lettered (a to o), were traced through the 

 series, and each was found to contain an island of Langerhans sit- 

 uated near its center. The section passes through the island in 

 lobules a, e, i, j, and n. (Eugene L. Opie.) 



are filled with the injected mass, while the surrounding capil- 

 laries are, for the most part, empty. If instead of soluble 

 Berlin blue a granular injection mass for example, cinnabar 

 or ultramarine blue is used, the islands may be injected, while 

 the interacinar capillaries contain little of the injected mate- 

 rial. The glomerular net-work is in very free communication 

 with the smallest arteries, and apparently has a richer blood- 

 supply than other parts of the lobule. 



