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T. H. MORGAN. 



feathered male are also barred ; this too is lost after castration 

 (Fig. 3, I), b 1 }, when the tip becomes white, more pointed, and 

 hackled. The change in the neck feathers (Fig. 3, c, c 1 ) is not 

 so striking because they are already somewhat elongated and 

 white as in the hen, but after castration they increase greatly in 

 length, more in fact than shown by the feathers in the pictures. 





FIG. 5. Feathers of Fig. 4, a, b, c, d, before castration, and a 1 , b 1 , c 1 , d 1 , after 

 castration on Sept. 15, and a 2 , b 2 , c 2 , d 2 , on March 3, 1920. 



The feathers of the shoulder (wing-bow), of the hen-feathered 

 male are barred with broad bars, Fig. 3, d. After castration the 

 barring is lost, the outer ends of the feathers become pure white, 

 and on each side barbules are lacking over a broad zone. This 

 change, also, is towards cock-feathering as seen by comparing 



