498 



ANATOMY OF VERTEBRATES. 



gland, receiving the contents of the cells, which, as in the liver, 

 are the agents operating upon the blood-constituents so as to 

 convert them into ( pancreatic juice.' Hyde Salter, who found 



383 



384 



Pancreatic follicles ; Bat. Magn. 150 diam. ccxxxi. 



in the thin ramified plates of the 

 Rodents' pancreas the best condi- 



385 



Selective cells from the pancreatic follicles of the Rat. 

 Magn. 400 diam. ccxxxi. 



tions for microscopic scrutiny, has 

 given the following amongst other 



386 



Portion of epithelium lining a small dnct 

 l-400th of an inch in diameter. From a 

 Rabbit. Mag. 300 diam. ccxxxi. 



illustrations of the ultimate 

 structure of this gland. Fig. 

 384 shows a group of follicles 

 from the pancreas of a Rat, 

 viewed so as to bring their 

 centra] cavity into focus. 

 The average size of a pan- 

 creatic follicle is T fo of an 

 inch: they are commonly 

 arranged in groups of very 

 various numbers. 



In the follicles proteine 

 matter is formified or deve- 

 loped as selective cells, of 



from TJ Vo to 



__j n -f nr , •l-r.p'U Ultimate lobule or acinus of the pancreas of a Mouse. 



2 000 U1 UL1 in ^ u Magn. 180 diam ccxxxi. 



