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momeat advancing to the meridian of fome other place on the globe^ winds 

 the rarefied part of the atmofphere of courfe- moves, from Eaft to 

 Weft. As foon as the caufe of the rarefaction ceafes by the removal, 

 of the fun, the columns of air In the neighbourhood of the rarefied, 

 ace; rufii In to caufe an= equilibrium. This current forms the 

 trade- wind, and gives it continuance, within and near the tropics. 

 The caufe, however, is not fo general, as that it. may not be alteredi 



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by fome more powerful agent ; fuch as the vicinity of land, or a: 

 cloud pregnant with vapours and electric matter; 



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Though the lands in the South-Seas be of no confiderable extent 

 tliey have however, generally, the benefit of the fea and land- 

 breezes j fo that the reigning trade-wind only operates in the day- 

 time on the windward-fide of the ille, and afterwards follov/s the 



diredion of the fliores,, and falls every where perpendicular, or 

 fiearly fo, upon them ;. nay, on the lee-fide of the ifie, it becomesr: 



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contrary to the trade, but extends only a few miles more or lefs 



out to fea, in proportion to the.fizeof the land and other accidental 

 caiifes. I'n, the night-time, the fame wind, as it were, returns and. 

 goes out to fea from the land, keeping within the common, limits 

 of theijb alternate breeaes.. 



As the Eafi:erly winds reign with a peculiar conflancy vAth'm the.: 

 tropics, it has been likewife obferved; that,, without them, the- 

 Weilerly ones are the moft general, but their conflancy, both 



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