C. J. Bond 133 



Having ascertained that reformation of gamete-bearing tissue does 

 occur after removal in the male Fowl it became a matter of genetic 

 interest to ascertain whether the gametes which are formed in this 

 regenerated tissue resemble, in their hereditary characters, the gametes 

 which are formed by the original gland before removal. I will now 

 describe some experiments on Fowls and Pigeons which bear on this 

 point. 



Experiment 1. 



A Hybrid Silver Wyandotte and Brown Leghorn Cockerel (Cockerel 

 number 7) was bred of the following Genetic composition : 



Brown Leyhoru x Silver Wyandotte 



r 1 



15 S 16 V 



All resemble Wyandotte Mother All resemble Brown Leghorn Father 



I I 



Cock, Wyandotte Type x 3 Pullets, Brown Leghorn Type 



PL V, tig. i. 



I 



-n 



( 8 Wyandotte Type 7 Wyandotte Type 



/ 7 Brown Leghorn Type 7 Brow'n Legliorn Type) 



PI. V, fig. 5. 



Cockerel 7x3 Pullets 

 Brown Leghorn Type I Brown Leghorn Type 



r ] 



Is 6? 



All Brown Leghorn Type All Brown Leghorn Type 



PI. V, tig. o («). 



Cockerel 7 x Same Hens 



Subcapsular Orchectomy I 

 Oct. 1908 



I — 



I I 



All Brown Leghorn Type 



Thus Cockerel 7 produced chickens of the same Brown Leghorn 

 Type before and after regeneration of the testis, when mated with 

 the same hens. 



Fig. 6 (p. 134) shows a photo of the regenerated testes, life size, when 

 the bird was killed in June 1910. 



