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might well be exped.ed where the mean temperature of only a 

 few years obfervations could be procured. On this occafion I 

 cannot forbear remarking, that, in calculating the mean tempera- 

 ture of places on the obfervations of a few, or even of many 

 years, the extremes, whether of heat or cold that happen not 

 above once in ten years or ftill more rarely, fhould be omitted 

 and only mentioned in a note. 



The third obftacle, viz. the interruption of obfervations, and 

 alfo the 4th, 5th and 6th, cannot be remedied but by the efla- 

 blifliment of meteorological focieties in different parts of Europe, 

 annually communicating with each other (fo liberally endowed as 

 to be enabled to employ proper obfervers at proper diftances), and 

 obliged to publifh annual accounts of their feveral obfervations, 

 and to compare them with thofe made in foreign countries. When 

 the vafl importance of meteorological knowledge to agriculture 

 and navigation is confidered, there is at prefent fome room to 

 hope that eftablifhments of this nature may take place at no 

 very diftant period. 



The number of perfons, who, from a view of attaining a fettle- 

 ment in fuch eftablifhments, would receive an education in the 

 different fciences conneded with meteorology, (that is indeed all 

 the different branches of mathematics and natural knowledge), 



and 



