[ 389 ] 



On exaroining this table it will be feen, i^. That the mercurv 

 riCesJboner in ihejbuibern latitudes than in the northern^ (when both 

 are fubje6l to the fame current) thus it was rifing on xhe Jirfl of 

 May at Orfka while it was falling at Peterfburgh. See alfo May 

 7th, 15th, and 20th. And it began to rife fooner at Peterfburgh 

 than at Ponoi or -Umba. See May 4th, 8th, and iitli. But the 

 variations of the rife and fall are lefs diftant in point of time, be- 

 caufe, though Kola is more northern than Peterfburgh, it is alfo 

 more eaflern, and therefore the appulfe of the current is more 

 nearly fimultaneous than its appulfe to Orfka, which is both more 

 fouthern and more eaflcrn, and therefore receives the fuperior 

 effluence fooner. 



2°. Ponoi and Umba are near each other, and therefore their 



variations, in every fdnfe, differ little from each other; but Umba 



being fome degrees more eafterly, the rife there fomewhat precedes 



that at Ponoi. - 



Vol. VIII. 3C 3tio. 



