T. H. MORGAN 



PLATE 8 



Breast 



JULIUS BIEN, N.Y. 



Feathers from hen-feathered male Sebright (J, 2, 3, 4) that changed to cock- 

 feathered male (la, 2a. 3 a . 4a) after castration; and then began to go back as the 

 testes regenerated (l'>, 2 b . 3 b , 4 b ) ; then changed again to cock-feathering after 

 castration ( lc, 2c, 3 C , 4<=) 



