r 30^ ] 



ratore may indicate a far f mailer quantify of moifture than a 

 low hygrometrical degree in a high temperature. 



Saussure did not ftop at thefe general indications. He has 

 given us, i" The a^/«/^ quantities of moifture, correfponding with 

 each hygrometrical degree, contained in the French cubic foot 

 (that is 1,210 Englifh) at the temperature of 15^,16 of Reaumur, 

 equal to 65,8 Fahr, or rather 65,4, for he negleds the fradion 0,16: 

 2do. the abfolute quantities of moifture in the cubic foot, 

 correfponding with every five degrees of the hygrometer, com- 

 mencing at the XLth, at every fifth degree of Reaumur, commenc- 

 jngr at — 10 =^ 9*^,5 of Fahr : but on the accuracy of this table 

 he does not fo much rely, as on that of the firft. Fortunately, 

 extreme accuracy for the general purpofes of meteorology is not 

 requifite : 3tio. he has given a table of the diminution of the 

 menftrual power of air when rarefied to the degrees denoted by 

 barometrical heights. With refped to the principles on which this, 

 table is founded I do not however perfedly agree with him. 



Of the firft table I fhall here tranfcribe fuch degrees as appear 

 to me moft curious and ufeful. . 



A 



TABLE 



