39© THE STRUCTURE AND LIFE OF BIRDS ch. xv 



The Partridge lays at least twelve eggs — sometimes 

 over twenty — the Snipe only four. 



This chapter which, as I have said, is only intended 

 to give some idea of the general principles of classi- 

 fication, must now come to an end. Those who wish 

 to make a study of the subject are referred to the 

 books that deal specially with it. 



Some of the Literature of the Subject. 



Elements of Ornithology. St. George Mivart. [The best 

 book for beginners.] 



Classification of Birds. Henry Seebohm. 

 Bronn's Thier-Reich, vol. a Aves. : ' Dr. Gadow. 

 Vertebrate Anatomy. Professor Huxley. 



