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laticmic 47*-' ami 60"^ on the weftern fide of our hemifphere, the 

 weft wind, v/ith feme participation of the north or fouth, is 

 that which obtains oftenefl. 39 Roz. Jour. p. 267. Leche ob- 

 tained the fame refulc at Abo, latitude 60^, from twelve years 

 obfervations, Mufchenbroock in Utrecht, Mr. Dalton in Weft- 

 morland, latitude 54'' (fee his Meteorolog. EfTa^/s, p. 48 and. 88) 

 fi-om five years obfervations. 



This wind in ovir continent originates in the Pacific ocean, 

 between the above mentioned parallels, at lead in winter ; the 

 air incumbent on that ocean is then much warmer than that 

 of SiLeria and Chinefe Tartary that lie weft of it, this there- 

 fore prelTes upon and flows into the fupra-marine, and is imme- 

 diately fucceeded by air ftill farther weftwards, and thtis a cur- 

 rent is gradually eftabliflied extending to the Atlantic, which, 

 though in winter, being much warmer than the air of the iflands 

 and continent on which it flows, is forced into the current, 

 both by the rupture of the equilibrium to the eaftwards, and 

 by the prefTure of the much colder air of the continent of 

 North America. 



Of 



