TESTICLE AS GLAND OF INTERNAL SECRETION 499 



formed can evolve for its own account. For example, one of them can 

 destroy itself by "earyorrhexis," while the other is the seat of an "atypic 

 mitose." The interstitial cells are not involved in these degenerations 

 and the sexual libido is preserved. 



In conclusion, the degenerate phenomena which are seen in the testi- 

 cles of captive animals are not characterized by their nature but by their 

 extreme frequency and their variability ; the testicle reacts in a uniform 



Fig. 6. What remains of a guinea pig testicle that was replaced in the abdomen 

 after arteries and veins were ligated. 



manner to many factors which determine the disappearance of its seminal 

 tissue. 



In the ectopic testicle the interstitial cells are more numerous pro- 

 portionally than in the normal testicle. At the same time they are 

 smaller and less compact. Their nucleus presents the same variations 

 of color; their protoplasm has the same general structure as the normal 

 testicle. 



The product of secretion revealable by hematoxylin-copper is a little 

 more abundant and presents itself in the form of large peripheral drops. 



These cells contain also a small quantity of fatty droplets. 



