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the fouth to the coaft of Valencia, I do not think 

 it a certain argument, that they come from Afri- 

 ca ; for to me it feems contrary to reafon to ima- 

 gine, that after birds have lived in the fummer 

 heats of Africa, they fhould go to Spain, and on 

 farther northward, to fuftain the cold of a win- 

 ter, in a country fo far north of their fummer 

 habitation; for it is generally believed, that birds 

 pafs, in order to attain habitations of near the 

 fame temperature with thofe countries they come 

 from -, now, feeing the fea- coaft of Valencia lies 

 north and fouth, an eafterly diredion only can 

 bring thefe birds from the fea. Now, I fuppofe, 

 that when birds depart from their fummer habi- 

 tations, they gather into great flocks, and have a 

 certain courfe to diredt themXelves in ; and that 

 in their greateft rout they may fly fo high as to 

 be out' of fight ; and, when they have arrived at 

 the place of their winter's habitation, they may 

 feparate into lefler flocks, in order to cover fome 

 large country ; thefe lefler flocks may tend to 

 every point of the compafs ; after this they may 

 feparate, and difperfe themfelves fmgly, in order 

 the better to accommodate themfelves with food, 



and 



