Fig. 29. Photomicrograph of a testicle removed from a cockerel two months old 

 and placed in a two months old pullet on the site of the removed cvary. Nine months' 

 thereafter the bird was killed and the grafted testicle removed. It had increased in 

 volume about 7 times and, as can be seen in the photomicrograph, was in active sper- 

 matogenesis with excellent preservation of all the testicular elements. The bird showed 

 the spurs, comb development, and plumage changes of the male. 



; 



Fig. 30. A high power photomicrograph of above showing the formation of sper- 

 matozoa in the transplanted testicle. 



521 



