INTERNAL SECRETION OF TESTICLE 



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Fig. 68. — Section through testicle of rabbit 6^ months old, with normal 

 sex characters (Prot. Nr. 94; unilaterally castrated at age of 6 

 weeks). Complete spermatogenesis; spermatozoa present in 

 epididymis. Well developed interstitial cells (big spherical nucleus, 

 big area of propotoplasm). — ^Prepar. and design of Wagner. 



