[■ 395 ] 



but I think the alleged fufEciently prove that the general cad 

 wind is not fupplied folely from the north or fouth in the dif- 

 ferent hemifpheres refpedlively. 



4°. Because during our fix fummer months, when the fun is' 

 in or approaches to the northern tropic, the eafierly trade wind 

 partakes lefs of the northerly, than when the fun is in or ap- 

 proaches to the fouthern tropic. 2d, Phil. Tranf. Abrid. p. 134, 

 and Schued. Abhandl. 1762, p. 175,' which is diredlly con- 

 trary to Hadley's fyftem ; for when the fun is in the fouthern 

 tropic, the north wind mufl traverfe more of that fpace in which 

 the earth's motion eafiward is ftrongeft, and therefore fliould 

 participate more of that motion . as Hadley himfelf ftates : : 

 though ftill partaking of it in a fmaller degree than that which 

 the globe itfelf pofTefTes, it fhould appear, to move weftwards ; 

 yet it fhould proportionably retain lefs of its original direction 

 from north to fouth, than when it had traverfed a fpace more 

 diftant from the equator, whereas the fadl is, that it retains more, 

 and often pafles into the fouthern hemisphere into the 1 3*^ fouth 

 latitude without having any eaflern direction. 3 Marchand, p 551; 

 and an analogous fadl is obferved with refpedl to the fouth eaft 

 wind when the fun is in the northern tropic. Hence it is evi- 

 dent, that it is from the approach of the fun, and not from the 

 latitude traverfed, that the eaflern diredion is derived ; nay the 

 ■wind is often more eafterly than northerly between latitude 23? 



and 



