PLATE XI. 



A : Wing of Lark, showing the elastic ligament that holds the 

 primary and secondary feathers. Another ligament nearer to 

 the base is faintly shown. B : Primary wing -feathers of Black 

 Vulture (on left) and Pink-footed Goose, upper surface ; of 

 Heron, under surface ; and outer tail-feather of Heron. In all 

 the inner web is the broader. (See Chap. VII.) 



[To face p. 85. 



