r 



r 275 ] 



as its natural mean, the mercury ftould fland at that height over 

 the level of the fea. 



Thus fuppofing the height to be 87 feet, equal 14,50 fathom 

 then 4771,21-14,50 = 4756,71, "hich is the logarithm of 29 9 •' 

 this therefore is the natural mean height of the barometer at ihe 

 elevation of Sj feet over the level of the fea. 



CoNSEquE.TLV to all the heights heretofore, calculated by the 

 ^ French over the level of the fea, 139,3, feet muft be added, 

 Enghfh meafure, when the Mercurial height at the level of the fea 

 was barely fuppofed to be 28 French inches. 



[ iTf^"'' '" /-/-^/«^.., I have eighteen years ago indicated 

 aftandard (none having been before thought of J with which the 

 temperature of all the inhabited parts of the globe, whofe lati- 

 tudes are g.ven, may be compared. La Cotte, whofe unceafing 

 [fabours contribute fo largely to the progrefs of meteorological 

 llcnowkdge, has fince extended this comparifon to 200 towns in 

 I30 different degrees of latitude, and found their mean tempera- 

 ture to coincide with my ef^imation twelve times. That the 

 ^reateft error was 6,75 degrees of Fahr. which occurred four times 

 and the mean error to be 0,36 of a degree of Fahren. ^j Roz' 

 D. 412. Such errors, not in the principles but in their application! 



might 



