108 DESCRIPTION OF PLATES. 



PLATE 9. 



FIGS. 1, IA. Typical feathers of hackle and saddle from hen-feathered bird (No. 68) 



plate 3, figure 2, that changed over to the cock-feathered bird of plate 3, 

 figure 3. 



FIGS. 2, 2A. Typical feathers of an Fi male (2) that changed over partly as a result of degen- 

 eration of his testes, into a cock-feathered bird (2A) . The change was not so 

 great as it is after castration. 



FIGS. 3, SA. Typical feathers of Sebright male that slightly changed towards cock-feathering 

 (old hackle feather missing). 



PLATE 10. 



FIGS. 1, IA. Old (1) and new (!A) wing-coverts of normal Sebright (1) and castrated (!A). 

 FIGS. 2A, 2s. Upper row, to right, "Transitional" hackle feathers (2A), and a slightly 



later changed-over feather from wing-bow (2A), and from back (2s) . Second 



row, to left, old (2), transitional (2a), and changed-over feather (26), from 



saddle of Sebright. 

 FIG. 3. Three feathers (tail-covert, wing-bow, and saddle) of an F 2 hen-feathered game-like 



male. 

 FIG. 4. A series of breast feathers from an F 2 bird. At one end of the series (the left) the 



feather is spangled, at the other barred. 

 FIG. 5. A series of breast feathers from another F 2 bird. At one end of the series (the 



left) the feathers are penciled, at the other end they are barred. 



