T. H. MORGAN 



Breast 



JULIUS BIEN, N, Y. 



Featht-rs from hen- feathered male Sehright (J. 2, 'i, 4) that chan;-;e<l to cock- 

 feathered male ( l'"", 2^. S^. 4^) after castration; and then began to go back as the 

 testes regenerated ( V>, 21'. .->. 41') ; then changed again to cock-feathering after 

 castration (K, 2c, Z'^, 4c) 



