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JOHN SUNDWALL 



readily demonstrated with iron haeniatoxylin, copper chrome 

 haematoxyUn, neutral gentian, and neutral safranin. In the 

 tubules and intercalary ducts they appear either outhning the 

 lumina and the secretion capillaries or as lines varying in length 

 projecting basalwards between the cells (fig. 19). As already 



Fig. 19 Tubules, Teeli. IV, 2, a; V, 0. Zeiss, oc. 2, Leitz. obj. iV oil — showing 

 secretion capillaries and cement substance. Xote varying intensities of stain- 

 ing of the granules. A, deeply stained granules; B, faintly stained granules; 

 C, secretion capillaries. 



Fig. 20 Intralobular duct, cross section, tech. same as figure 19. Cement 

 lines projecting towards the base of the cells and between them — A. 



stated, the cement substance is much modified in appearance 

 by the secretory stage of the cells. If the cells are in a maximum 

 stage of granule formation the secretion capillaries may be 

 completely obliterated, in which case the cement substance 

 likewise may be completely obscured or may be seen as fine 

 lines extending between the cells towards their basal membrane. 



