[ 354 ] 



in the courfe of feveral years*. But this country being moun- 

 tainous they are probably lower than in others under the fame m 

 parallel. Lambert, in Berlin, latitude 52^.32', in the month of 

 July 1773. found their height 7792 feet, thermometer 65°, and . I 

 the barometer fomewhat below its mean heightf. Schuckburg 

 alfo remarks, that clouds freque'Jt'y reft below the fiimmit of 

 Saieve, whofe height is 2831 feet. Phil. Tranf. 1777, p. 538, and 

 Gentil at Pondicherry, latitude i%P, obferved ibme at the height 

 of 10240 feet. 2 Voy. p. 79. 



The weight of clouds, SaufTure eftimates at one-third or one- 

 fourth of that of the cubic foot of air in which ihey fubfift. Hy- 

 grometer, p. 270. When the barometer rifes, clouds are partly 

 difiblved, as denfe air is a better folvent than rarer air, and 

 partly rife higher in confequence of the increafed fpecific gravity 

 of the inferior air ; when the barometer falls the contrary takes 

 place. 



CHAP. 



* D' Alton's Meteorological Obfervations, p. 41. 

 f Mem. Berlin, 1773, p. 44. 



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