INTERNAL SECRETION OF TESTICLE 



121 



generative cells. From the generative epithelium formed by 

 the mesoderm would be derived not only the generative cells. 









V ^^m\'' 





% %, <®^ 



Fig. 57D. — Development of interstitial tissue in guinea pig. 

 Two to three weeks old. 



Note the gradual transformation of the spindle-shaped cells of the 

 interstitial tissue into epithehoid cells. They are few in A and 

 B; they fill up almost the whole intertubular space in C and 

 D. — Prepar. and design of Wagner. 



but also the elements which are to be found between the 

 generative parts ; such a suggestion has been already made by 

 several authors. . . . Generative cells and interstitial cells 



