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CLASSIFICATION OF ANIMALS. 
Having considered the animal kingdom with 
yeference 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. 
THE VBRTEBRAL ANIMALS ARE DISTRIBUTED 
INTO FOUR CLASSES. 
4. MamMALia, viviparous and the young nour- 
ished by the milk ef the dam. 
Heart with two ventricles and two auricles.— 
Lungs respire alternately. 
Examples. Man, ape, bear, beaver, sloth, horse, 
ox, Whale. 
2. Avis, oviparous, having two wings and two 
eet. 
Heart with two ventricles and two auricles, ce- 
vering imbricate feathers. Lungs ventilated by 
alternate contractions and expansions of air cells 
below thei ; not by their own motion. Jaws, or 
mandibles, naked and without teeth. Ffars with- 
eut auricles. | 
Examples. Hawk, swallow, parrot, hen, crane, 
=00se. 
3. AmpuHinia, capable of suspending respiration 
a long time, without impeding the circulation of the 
blood.* Oviparous or viviparous, without fins. 
Heart with one ventricle. Cold-blooded, coy- 
ered with strong scales or with a naked skin. 

* Cuvier and several other zoologists substitute reptilia for amphtbte. 
Cuvier’s own definition is founded on the amphibious nature of thig. 
class ; while the lizard and frog are not reptilious. 
