EFFECTS OF CASTRATION OF HEN-FEATHERED CAMPINES. 235 



Fig. 3, a 1 , b 1 , c 1 , d 1 , where they are accompanied by feathers from 

 the same region of an adult hen-feathered Campine (Fig. 3, 

 a, b, c, d). Taking these in pairs we see that the beautiful bar- 

 ring of the saddle feather (Fig. 3, a) gives way in the castrated 



FIG. 4. Second "larger" bird castrated June 16, 1919. A, as it appeared 

 Sept. 9 ; and B, as it appeared March 2, 1920. 



bird to a pointed white feather, black only at its base (Fig. 3, a 1 ). 

 The sides of the outer portions of this feather lack barbules as 

 in the common cock. The feathers of the back of the hen- 



