22 FIRST CLASS ; 



III. FER;E, or animals whose cutting teeth vary from 

 ten to two. This order includes most of the formidable 

 rapacious quadrupeds ; as the lion, the tiger, the bear, &c. 



IV. GLIRES, or animals which have only two cutting, 

 and no canine teeth; as the hare kind, the mouse, the 

 squirrel, &c. 



V. PECORA, or animals which are hoofed, and hare no 

 cutting teeth in the upper jaw : including the camel, the 

 deer, the sheep, the ox-kind, &c. 



VI. BELLU^E, or quadrupeds with cutting teeth in each 

 jaw, as the horse, the boar, &c. 



VII. CET^E, or animals whose teeth greatly vary in dif- 

 ferent genera. This order comprehends all the whale 

 tribes ; which, from certain similarities of structure, have 

 been arranged under the class of quadrupeds. All the 

 mammalia are viviparous, and have two ventricles to the 

 heart, with hot red blood. * 



It is evident, that in this as well as in the remaining 

 classes, many dissimilar animals are thrown together on 

 account of some coincidences which constitute the syste- 

 matic uniformity. Indeed, all arrangements in Natural 

 History, however ingenious, are chiefly useful as helps 

 to the memory : and that classification of animals which 

 is the simplest, and can be most easily remembered and 

 compared, is probably the best ; a due regard, however, 

 being paid to accuracy of description. In ethics, meta- 

 physics, and mathematics, every definition must be pre- 

 cise, because these sciences are founded on definitions 

 only ; but it is otherwise in those where the exhibition of 

 the object itself is capable of correcting the error. Still, 

 however, a minute attention to system is of use with 

 such as are advanced in years, but facts and descriptions 

 are most acceptable and serviceable to youth : for this 

 reason I shall omit all generic distinctions in my selec- 



* These definitions of the seven orders should be committed to 

 memory by the young student 



