THE BAROMETER AT THE LEVEL OF THE SEA. 23.9' 



The greatest observed diiference is between Madeira and Godthaab, 839"'-2 

 -333"'-3 = 5"'-9 ; the formula gives only 4"'0. According to this table I have 

 constructed a curve, which represents the variation of 4 from equator to the pole ; 

 but it is too voluminous for a letter. 



If the observations are correct, there is a discontinuity between the eastern 

 and western coasts of the Northern Atlantic Ocean ; for instance, Christiania, 

 Bosekop (Norway), compared with Reikiavik (Iceland), and Godthaab, Godhaven 

 (Greenland) ; as also St Thomas (West Indies), compared with Santa Cruz, Tene- 

 riffe, and Madeira. If the Avhole globe was only an ocean, there would certainly 

 be no such irregularities. 



The Norwegian Government has, according to the demand of the Royal So- 

 ciety in London, resolved, that magnetical and meteorological observations, which 

 stopped at the end of June 1 843, shall be continued here a year. They were again 

 commenced the 15th August this yeai% and will be continued to the same date in 

 1847. The unifilar is observed every tenth minute, mean time Gottingen ; the bi- 

 filar and meteorological phenomena, every full hour. I am, Sir, sincerely yours, 



Chkistophek Hansteen. 



