499 



of the terminal acini, are composed of clear transparent cells, many 

 of the terminal acini of darkly staining granular cells. The appearance 

 of a portion of a lobule showing both kinds of cells is shown in Fig. 1. 



B 



« 



fc, 



M 



,,;, 



»fwSii ■ i ir ; " w 



^) *. jp LhYY/LDER' 



Fig. 1. Section of glands of Beunnee of the rabbit; iron haematoxylin. 

 M transparent mncons tubules. S.A. serous acinus, deeply stained. 1 : 400. 



The clear tubules of the gland are composed of large transparent 

 cuhoidal cells, surrounding a lumen 16 \i to 20 f.i in width. The 

 nucleus is oval, flattened, or crescentic, and is located at the base of 

 the cell. Around it is found a small quantity of finely reticular 

 cytoplasm. The body of the cell is clear and transparent and ex- 

 hibits a coarse network of faintly staining trabeculae in which the 

 stored- up secretion is lodged. Frequently this clear secretion-filled 

 portion of the cell is subdivided into two secondary clear zones, as 

 may be seen in the figure, by a band of denser cytoplasm, stretching 

 across the equator of the cell. 



The appearance of the cell is strongly suggestive of a mucous 

 cell and it is thus that many observers have interpreted it. This 

 conclusion has, however, been weakened by the failure to stain the 

 secretion with mucous stains, especially with the muchaematein and 



32* 



