Elementary Zoology. 



114 



second feather often arises from the main shaft; this is the 

 after-shaft. The rhachis gives off numerous barbs, which in 



\ 



Fig. 57. — Feather. (From Gadow, in Newton's " Dictionary of Birds.") 



D, downy portion ; P, horny cap (" Feder selle '*), continued through umbilicus as F* \ 

 to right of this springs aftershaft. 



turn give rise to secondary branches, the barbules, and these 

 again to shorter processes, the barbicels, which are often 



