46 THE BEAUTIES OF NATURE chap. 



dications of descent from ancestors in which 

 these organs were fully developed. Again, 

 though used for such different purposes, the 

 paddle of a Whale, the leg of a Horse and of 

 a Mole, the wing of a Bird or a Bat, and the 

 arm of a Man, are all constructed on the same 

 model, include corresponding bones, and are 

 similarly arranged. The long neck of the 

 Giraffe, and the short one of the Whale (if 

 neck it can be called), contain the same 

 number of vertebrae. 



Even after birth the young of allied species 

 resemble one another much more than the 

 mature forms. The stripes on the young 

 Lion, the spots on the young Blackbird, are 

 well-known cases ; and we find the same law 

 prevalent among the lower animals, as, for 

 instance, among Insects and Crustacea. The 

 Lobster, Crab, Shrimp, and Barnacle are very 

 unlike when full grown, but in their young 

 stages go through essentially similar metamor- 

 phoses. 



No animal is perhaps in this respect more 

 interesting than the Horse. The skull of a 

 Horse and that of a Man, though differing so 



