Concerning 
Feathers. 
(no) 
THE BIRD WORLD. 
Fig. 5.—Two barbules of the posterior series 
(magnified). 
Fig. 6.—Two barbs with barbules (magnified). 
Concerning Feathers. 
j? 
See “ A History of Birds , 
fages loy, 109, no. 
Fig. 6a.—Diagram to show method 
of interlocking. 
