C. J. Bond 135 



Regeneration of Testes in Pigeons. 

 Experiment 2. 

 A Blue Checquer Fan tail wiis bred of the following Genetic 



Blue Checquer x Same Hen 



Subcapsular Orchectomy 

 Oct. 1908 



rchectomy I 

 ^08 



Dec. 1908 to July 1910 



I 

 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 months. 



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

 the same size. 



