190 JOHN SUNDWALL 



cell or throughout the cytoplasm and stam with different de- 

 grees of intensity — many are but faintly stained. These will 

 be referred to as type 2, The cells of the other group (type 3) 

 are similar to those of type 2 in form but are full of deeply stained 

 granules. 



Generally there is no regularity of distribution of these various 

 types. Tubules are seen wherein all the cells composing them 

 are of the first type. Others are seen made up of all three types. 



Occasionally glands are obtained wherein practically all the 

 cells within the tubules are cuboidal in form and show the granules 

 proximal to the nuclei as described under fresh tissue (Fresh 

 tissue C). Here the cells are not large or bulging and the lumina 

 are open. 



In other sections, which are rare, one sees numerous granules 

 with deeply stained rings around them. These were described 

 by Fleischer who considered them as a stage in lachrymal secre- 

 tion. I do not think such is the case, however (see Discussion 

 of granules.) 



The cells of the intercalary duct show the same characteristics 

 as those described in Zenker's celloidin preparations. 



Ifon haematoxylin. In iron haematoxylin stained sections 

 one sees the same types of cells described under the mucous 

 stains. The large bulging type 1 cells are filled with black 

 granules of various sizes, the nuclei angular or flattened against 

 the bases of the cells. The type 2 cells have grayish granules 

 and their round or oval nuclei show as a rule one or two large 

 chromatin masses. The type 3 cells are filled with deeply stained 

 granules or a mixture of both black and gray granules. 



The different intensities of the staining reaction on the part 

 of granules is a striking feature of the tubules. Large and small 

 granules may be seen side by side in the cell some staining deeply 

 black while others are gray or faintly stained. The granules of 

 the intercalary duct vary also in the intensities of staining re- 

 actions but not to such a degree as those of the tubules. 



Iron haematoxyliii and mucicarmin. Sections stained with 

 iron haematoxylin and counterstained with mucicarmin show 

 some very interesting features. All the granules of certain 



