[ 39^ ] 



and 28, Fofter's Obfervations p. 126. He even obferved, that 

 the trade winds extended far beyond the tropics when the fun 

 is in the fame hemifphere, which fliews it is the fun that caufes 

 them. 



Eduy is a term inttoduced on this fubjecft, which explains 

 nothing when its caufe is not afiigned and proved ; the trade 

 winds are often interrupted by the approach of land, but the 

 interruption, as Fofler mentions, extends only to a few miles. 

 Ibid. 127. 



The mmfoons or periodical trade winds, depending on local 

 circumftances - fufEciently explained by Dr. Halley, I fnall here 

 pafs over ; though certainly much may be added from obfer- 

 vations made by fubfequent navigators and travellers. J fhall 

 therefore confine myfelf to the variable winds, a fubjed much 

 more obfcure. 



Section IV. 



Of Variable Winds. 



With refpecl to winds we rauft lay down one general and 

 fundamental principle, which is, that they always originate at 

 the extremity of that point towards which they proceed. Thus 



the 



