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R. R. BENSLEY 



ing from the main duct, some from its side branches In others 

 there may be large sections of the duct which show no such 

 branches, while at other points they may be abundant. Age 

 seems to have little influence on the numbers. 



The epithelium of these tubules is composed of low epithelial 

 cells, which appear cubical when cut across, but are seen to be 

 irregularly polygonal when viewed from the surface of the tubule, 



Fig. 5 Duct with branches showing the highly branched tubules connected with 

 the duct and with an islet. Intra vitam staining with pyronin and neutral red. 

 X 77. 



one axis of the cell being elongated in the direction of the long 

 axis of the tubule. The nuclei, hkewise, are oval, their long axis 

 corresponding to that of the cell. A few mitoses may be observed 

 in these cells. The protoplasm contains numerous mitochondrial 

 filaments, which may be demonstrated by the acetic osmic bichro- 

 mate method, followed by staining by the acid fuchsin-methyl 

 green method. Except for these, the protoplasm appears homo- 



