CLASSIFICATION OF ANIMALS. 



Having considered the animal kingdom with 

 reference to the succession of animals in the or- 

 der of creation, and the sentient principle ; we 

 now commence with a system of classification, 

 adapted to the analysis of animals, for the pur- 

 pose of ascertaining generic and specific names. 



TlIE VBUTEBKAL ANIMALS ARE DISTRIBUTED 

 INTO TOUR CLASSES. 



1. MAMMALIA, viviparous and the young nour- 

 ished by the milk of the dam. 



Heart with two ventricles and two auricles. 

 Lungs respire alternately. 



Examples. Man, ape, bear, beaver, sloth, horse, 

 ox, whale. 



2. AVES, oviparous, having two wings and two 

 feet. 



Heart with two ventricles and two auricles, ce- 

 vering imbricate feathers. Lungs ventilated by 

 alternate contractions and expansions of air cells 

 below them ; not by their own motion. Jaws, or 

 mandibles, naked and without teeth. Ears with- 

 out auricles. 



Examples. Hawk, swallow, parrot, hen, crane ; 

 goose. 



3. AMPHIBIA, capable of suspending respiration 

 a long time, without impeding the circulation of the 

 blood.* Oviparous or viviparous, without jins. 



Heart with one ventricle. Cold-blooded, cov- 

 ered with strong scales or with a naked skin. 



* Cuvier and several other zoologists substitute rtptilia for amphibia, 

 Cuvier's own definition is founded on the amphibious nature of thJS 

 class ; while the lizard and frog are not rtptilious. 



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