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. 
