STRUCTURE OF BIRDS. 139 
Ly) 
gn) 
= 
JA 
=e 

Upper surface of Right Wing of a Bird extended to show the relations between the 
flight-feathers and coverts. 
— 
6. Minor coverts. 
. Marginal coverts. 
. Remiges of bastard wing. 
. Scapulars. 
. Primaries 
. Secondaries 
. Major coverts of primaries. 
. Major coverts of secondaries. 
. Median coverts. 
Remiges. 
ore cw bo 
co OO NI 

Under surface of Contour-feather showing aftershaft. 
1, Shaft (Rhachis). | 3. Quill (Calamus), 
2. Vane. 4, Aftershaft (Hyporhachis), 
