PLATE: XII. 
ae 
A and 
A pair of barbs 
f the feather. 
CN \ | Se \ \\ = 
% \ ex Rat No ASN L&R . % ei 
3,8 \ \ 4 NS NORE Ne a \ 4 a) 
EN \i AYA VR \ ‘\ x - a 4 if 
4 ' AAA fat 
EN ~ 
i 
ee ae ee ee 
La 
gs) Na oA An 
% es TEA 
(From Life and Evolution.) 
b) 
The barbs, barbules and barbicels of a flight-feather. 
x 90 diameters ; 
A barbe -C- 
A: 
250. 
B x 
C 
B: A pair of barbules, showing the barbi- 
on the one nearer to the tip o 
rlocking. 
eels 
showing inte 
To face p 86.] 
