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and other cattle, by laying their eggs on their 

 fkins amongft their wool or hair ; which eggs 

 produce worms that will eat through their fkins, 

 and deftroy the beafts, unlefs prevented by the 

 owner's care. • The generation of infeds is more 

 various and fuprifing than that of the other parts 

 of t;he animal creation : many of them appear 

 and ad as different animals, in fhapes very un- 

 like each other, though they are identically the 

 fame. 



In claffing of animals there is a very great 

 difficulty. In birds v/e place the feveral fpe- 

 cies of the fame genus together -, but, when we 

 have done this to the befl of our abilities, we 

 are doubtful which genus to prefer to the firft 

 place, and fo on to the laft ; for, I believe, no 

 two men, who had not confulted others, would 

 place them in the fame order. The like may 

 be faid of quadrupeds, fiflies, and the whole 

 tribe of lefTer animals. It appears, at fift view, 

 as if quadrupeds gradually declined into birds : 

 for the bat feems to have extended wings, and 

 adually flies -, and the gerbo hops like a bird 

 on its hinder legs, never ufing its fore paws or 



hands 



