C. J. Bond 135 



Regeneration of Testes in Pigeons. 



Experiment 2. 



A Blue Checqiier Fantail was bred of the following Genetic 



composition : 



<? ? 



Black Fautail x White Fantail 



I 



. , 



J ? 



Black and White Fantail x Black and White Fantail 



I 



r T- ^ -T n 



II II 



Black Blue Checquer Black and White White 



s ? 



Blue Checquer x Blue Checquer 



r ] 



Dec. 1906 to July 1908 



12 Blue Checquers 



Blue Checquer x Same Heu 



Subcapsular Orcheetoniy 

 Oct. 1908 



I 



"1 



Dec. 1908 to July 1910 

 17 Blue Checquers (4 with feathered tarsi and toes) 



The offspring of this Blue Checquer Cock after regeneration of 

 the testes are identical in plumage with offspring hatched before 

 subcapsular orchectomy. 



One point should be noted. Among the young hatched before 

 castration none showed any feathers on the toes, whereas out of the 



17 hatched after regeneration of the testes four showed signs of 

 feathered tarsi. 



Fig. 8 (1) (p. 136) shows the regenerated testes (life size) of the Blue 

 Checquer Cock one year and seven months after castration. 



Fig. 8 (2) shows photo of normal testes (life size) of a White Fantail 

 for comparison. 



Fig. 9 (1) shows photo of the testes (atrophied), life size, removed 

 from a White Fantail aged nine years which had been sterile 



18 month.s. 



Fig. 9 (2) shows the normal testes of a Fantail three years old of 

 the same size. 



