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1 have now fubmitted the beft anfwers that have 

 occurred, not only to the general arguments for the 

 migration of birds acrofs oceans, but alfo to the parti- 

 cular facts, which are relied upon as actual proofs 

 of fuch a regular and periodical pafTage. 



Though I may be poffibly miftaken in many of - 

 the conjectures I have made, yet 'I think I cannot be 

 confuted but by new fads, and to fuch frefh evidence, 

 properly authenticated, I ihsii moil readily give up 

 every point, which I have from prefent conviction 

 been contending for. 



I may then perhaps alfo flatter myfelf, that the 

 having expreffed my doubts with regard to the proofs 

 hitherto relied upon, in fupport of migration, may 

 have contributed to fuch new, and more accurate 

 obfervations. 



It is to be wifhed, however, that thefe more con- 

 vincing and decifive facts may be received from 

 iflanders (the more diftant from any land the better*} 

 and not from the inhabitants of a continent ; as it 

 does not feem to be a fair inference, becaufe certain 

 birds leave certain fpots at particular times, that they 

 therefore migrate acrofs a wide extent of fea. 



For example, ftorks difappear in Holland during 

 the winter, and they have not a very wide tract of 

 fea between them and England j yet this bird never 

 frequents our coafts. 



* I would particularly propofe the iflands of Madera and 

 St, Helena; to thefe, I would alfo add the ifland of Afcenfion 

 (had it any inhabitants), as likewife Juan Fernandez, for the 

 *Paclfick ocean* 



The 



