748 SPERM, OVA, AND PREGNANCY 





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Fig. 13.14. Aspermatogenesis induced in the guinea pig by injection of testicular ho- 

 mogenate and adjuvant. A, normal adult guinea pig testis used as donor, approx. 65 X, B, 

 same, approx. 260 X ; C, testis of semicastrate 2 months after injection of autologous testicu- 

 lar homogenate, 65 X ; £>, same, 260 X, note normal interstitial tissue; E, testis of guinea p-g 

 injected at 1 week and sacrificed at 5 months of age, 65 X ,: F, same, 260 X. (From D. W. 

 Bishop, unpublished photographs.) 



