INTERNAL SECRETION OF TESTICLE 



139 



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Fig. 70. — Section through testicle of rabbit 6 months old, with 

 normal penis. Same litter as Figs. 71 and 72. Seminal 

 tubules with one stratum only. Well developed 

 interstitial cells. — Photo of Kull; from Wagner and 

 Loeper. 



