[ 3^4 J 



As air at each degree of heat may contain various degrees of 

 moifture, from the extreme degree of drynefs up to the extreme or 

 faturating degree of moifture, every hygrometrical degree may be 

 found in each degree of temperature, and confequcntly tables fimi- 

 lar to the laft might be formed for each degree of temperature. 

 To form fuch tables with due accuracy would require the labour 

 of many years. Hence Sauffure, in the fecond table, has only 

 marked the quantity of moifture in a cubic foot, correfponding 

 with a few of the hygrometrical degrees at each 5th degree of 

 Reaumur, from — lo*^ to + 30° Reaumur. 



The faturating quantity of moifture in a cubic foot I call its 

 hygrometrical complement. As Sauffure has given the complements 

 of only every fifth degree of Reaumur, I have interpolated four 

 arithmetical means for the complements of the intermediate de- 

 grees, but to diftinguifh them from thofe of Sauffure, I have 

 added S to thcfe laft. 



I have alfo given Fahrenheit's degrees under thofe of Reaumur. 



This table I have contrived to fill by taking the ratios, each 

 hygrometrical quantity, at each degree of heat, bears to the com- 

 plement, as ftiewn in page 310, but'I have calculated only to 80^ 

 of Fahr. 



TABLE. 



