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JOHN SUNDWALL 



out the entire length of the cell (fig. 15.) Cells are frequently 

 seen, however, in which the mitochondria appear in heaps with 

 no definite arrangement whatsoever. 



The mitochondria of the ducts are readily seen when preserved 

 in Bensley's sublimate alcohol bichromate solution (Technique 

 IV, 2) and stained in copper chrome haematoxylin (Technique V, 

 5). Here they have an arrangement similar to that already 

 described. Whether the mitochondria in the tubules and inter- 





Fig. 15 Mitochondria in interlobular duct, Tech. same as figure 14. Here 

 they are arranged as filaments. 



calary duct are preserved I can not say. It will be recalled that 

 this fixative preserves the secretion granules and these stain 

 deeply black in this copper stain. Consequently the mitochon- 

 dria if present are masked. I did not see them in tissues of this 

 fixation when stained with iron haematoxylin or the neutral 

 stains — neutral gentian, and neutral safranin. In all likelihood 



