18 



THE BIRDS 



Main lail orvnng 

 leather 



tSoH "body i€>ai:hc>r 



Dovmy hairs 

 '^ -barb 



QaiH 



Enlarged detail 



Enlarged delaU 

 oi o.o'wn or TlttTT 



Fig. S. — Details of a feather. 



