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2d°. The North Pacific Ocean is colder than the North Atlantic 

 between the fame parallels, becaufe the fuperior current thatpaffes 

 over the North Pacific is ent'ncly /u/>ra-marine, and for the fame reafon 

 eaftern Siberia is much colder than its more weftern trads. But 

 the current that paffes over the eaftern parts of the North Atlantic 

 is in great measure /upra-terrene, for it iffues from Guinea, Sene- 

 gambia, and a fkirt of the great defert. So alfo the current that 

 paffes over the vsreftern parts of Siberia, being derived from Siam, 

 Ava, and the more fouthern iflands. But the current that paffes 

 over the eaftern regions of North America is entirely Jupra-rnarine, 

 as it originates on the Atlantic Ocean ; whereas that which paffes 

 over the correfponding European trads, Hungary, Poland, Ger- 

 many, Sweden, France, Spain, Italy, and the Britifh iflands, is 

 eni'ireiy Jupra- terrene, arifing from air fuper-incumbent on fouthern 

 and northern Africa. Thefe diredions from the fouth to the N. N. 

 Weft may eafily be traced on a map, obferving to allow from one 

 to three points to the weftern diredlion. 



The 3d phoenomenon is due to the re-inforcement of the fame 

 caufe. In the months of December, January, and February, the 

 fuperior current is then more copious, as the intra-tropical air is 

 is then more heated, and hence adds more to the weight of the 

 northern air, and confequently mercury in barometers mufi 

 ftand higheft ; but as this current foon diffufes itfelf over regions 



on 



