PHYSIOLOGICAL PROPERTIES OF GONADS 



153 



chronic ; state of inflammation, and they have not been found 

 associated with the ovarian grafts. The second type of cell is 

 about the size of the eosinophiles, possessing homogeneous 

 cytoplasm and distinct well-rounded and well-stained nuclei. 

 Depending upon the extraction of the stain from the preparations, 



Fig. 15 Tubules of normal testis of rat 49 A (one testicle was removed at 

 operation, and the rat had borne two large subcutaneous ovarian grafts for 232 

 days — graft 49 A, 1 and 2). St, seminiferous tubules containing spermatozoa; 

 ic, interstitial cells. 



the cytoplasm is light blue in color or a slight pink. These cells 

 are entirely foreign to the normal testis and their significance 

 is not understood. It is difficult to decide whether the quantity 

 of interstitial cells is increased or decreased, for the interstitial 

 cells of the rat's testis have no distinctive features that will 

 class them unmistakably as interstitial cells. However, there 



