INTERNAL SECRETION OF TESTICLE 



159 



very small testicular fragments were sufficient for a normal 

 development of the sexual characters. One might, indeed, 

 object that the seminiferous tubules are as a rule degenerate, 



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 'P ^.%' **<-* 



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Fig. 83. — Section through testicle of guinea pig subjected to 

 operation V. of Fig. 64 (Prot. Nr. 72). x 280. Operated 

 at weight of 516 gr. ; testicle removed about 4 months 

 later. Backward development of seminiferous tubules. 

 Increased number of interstitial cells. — Prepar, of 

 Wagner; photo of Kull. 



and the result is that the fragment is diminished in size; 

 in reality the size estimated by weighing or by microscopical 

 observation indicates a far greater "potential" volume of the 

 fragment. But we observed a case where in the testicular 

 fragment (of the under pole — a guinea pig) almost all the 

 tubules were fully developed, and nevertheless the volume of 



