STRUCTURE OF BIRDS. 



89 



The feathers covering the back are named dorsal ; the breast, 

 pectoral ; the sides, h}'pochondrial or lateral. 



In the tail are distinguished the tail-feathers, or tail-quills, 

 31 ; and the upper and lower tail-coverts, the latter marked 32. 



Fig. 34. The Kestrel. 



The wings are the anterior extremities, in which are distin- 

 guished the different parts already pointed out in speaking of 

 the skeleton ; the humerus, cubitus, and hand or pinion. 

 Hence the quills, or large feathers, are divided into humeral, 

 usually termed tertiary by ornithologists, who begin to count 

 at the wrong end, 83 ; cubital, or secondary, 34, and Fig. 29, 



