INTERNAL SECRETION OF TESTICLE 



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Fig. 66. Section through testicle of rabbit about 8 months old, with 

 normal sex characters (Prot. Nr. 49; horizontal incisions on the 

 testicle performed at an age of 2 months). Same magnification 

 as Fig. 65. Puberal transformation of penis took place only at 

 an age of 7 months (normally at 4 months). Only beginning of 

 spermatogenesis; great quantity of cells of Sertoli in the 

 tubules, possibly also spermatogonia, but no spermatocytes. 

 Pronounced desquamation. Big interstitial cells with big 

 spherical nuclei; several mitoses. To be compared with 

 Fig. 65. — Prepar. and design of Wagner. 



