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hands in its progrefTive motion, which is an 

 a6lion that belongs to birds : yet, on a flridl 

 examination, neither of thefe animals have any 

 relation at all to birds ; for they bring forth 

 their young alive, they nourifh them with their 

 milk, they are covered with hair, they have 

 teeth, and, in lliort, four limbs or legs, as other 

 quadrupeds have. The bat, indeed, has the 

 fingers of its arms or fore legs greatly length- 

 ened, and conne6led by fine membranes, to 

 enable it to fly in the air : the gerbo has alfo 

 hands or fore feet, with fingers, in which it holds 

 its food, though it doth not put them to the 

 ground in its progreflion. 



On the other hand, quadrupeds feem to unite 

 with fifhes ; for it is doubtful whether we fhould 

 clafs the feveral fpecies of the feal kind with 

 the four-footed beafts or fifhes : they are hairy, 

 and have teeth like four-footed beafts ; but, 

 whether to call their extremities feet or fins, with 

 propriety, I do not know. Amongft birds, the 

 penguins from the Straits of Magellan, and 

 thofe from the Cape of Good Hope, (fee my 

 Hiftory of Birds, pi. 49 and 94) are accounted 

 F half 



