EFFECTS OF CASTRATION OF HEN-FEATHERED CAMPINES. 24! 



After castration this bird continued, as would be expected 

 under any circumstances, to develop cock feathering. Its con- 

 dition on Nov. 12, 1919, is shown in the photograph Fig. 6, B. 

 The condition of the bird on March 6, 1920, is shown in Fig. 6, 

 C. It was completely cock-feathered, but its comb was two 

 thirds full size. The condition of the feathers is shown in Fig. 7, 

 a 2 , b 2 , c 2 , d 2 . Before the operation June 17 the feathers were 

 intermediate in character (a, b, c, d). The back and saddle 

 feathers were somewhat pointed and the barring broken. After 

 the operation (Sept. 13) the feathers that came in changed 

 completely so that the bird became strictly cock-feathered. On 



FIG. 8. A, normal hen-feathered male nearly one year old from the same flock 

 as those operated on ; B, Campine hen from Wright's " New Book of Poultry." 



March 2, 1920, the change was complete (a 2 , b-, c 2 , d 2 }. The 

 bird was killed on March 6, 1920. Three very small pieces of 

 testis were found on the right side ; none on the left. The comb 

 measured three and a half inches long and two inches high. 



Dr. Nonidez has sectioned the pieces of the testes and makes 

 the following report. " The histological study of the three small 

 pieces found in the region of the old testis showed that they are 

 undergoing regeneration. The condition of the seminal tubules 

 in these pieces contrasts with that of the tubules in the testes re- 

 moved at the time of castration. While in the latter only sper- 

 matogonia occur in the tubules, in the regenerating testis the 



