'20 



ANATOMY OF VERTEBRATES. 



REPTILES. 



100-00 



100-00 



100-00 



100-00 



BIRDS. 



Soft 

 Hard 



Goose 

 32-91 

 67-09 



10000 



Turkey 



30-49 



69-51 



100-00 



Hawk 

 26-72 

 73-28 



100-00 



From the above table it will be seen that the bones of the 

 fresh-water fishes have more animal matter, and are, consequently, 

 lighter than those of fishes from the denser element of sea- 

 water ; and that the marine mammal called Porpoise differs little 

 from the sea-fish in this respect. The batrachian Frog has more 

 animal matter in its bones than the ophidian or saurian reptiles, 

 and thereby, as in other respects, more resembles the fish. Ser- 

 pents almost equal birds in the great proportion of the osseous 

 -alts, and hence the density and ivory-like whiteness of their 

 bones. 



The chemical nature of the hardening particles, and of the soft 

 basis of bone, is exemplified in the subjoined Table, including a 

 species of each of the four classes of Vertebrata : — 



CHEMICAL COMPOSITION OF BOXES. 



