﻿i7G 



FIRST BOOK OF ZOOLOGY. 



A B 



Tig. 154. — Embryo Birds in Various Stages of Development.—^, Chipping' Sparrow; 

 B^ Petrel ; (7, Tern seen from above. 



If, now, the bones of the wing of an embryo bird be ex- 

 amined, the bones of the extremity of the wing, instead of 



humerus 



fnetacarpiis ■{ 



carpus 



phalanges -^ 



Fro. 155. — Eight Wing of an Embrto Bird greatly knlaeoed. — Only a portion ot 



the humerus is seen. 



