[ 3i6 ] 



evaporation were taken three times in twenty-four hours, namely 

 at feven and twelve o'clock in the day, and at ten at night. 



On thefe obfervations I remark : 



lo. That in the firft and fourth, the quantities evaporated were 

 equal, though the temperatures of the air differed confiderabiy, 

 viz. 6°, 25, that, during the firft, being fo much warmer than 

 during the laft. This equality can be attributed only to the 

 greater faturability of the air in the lall cafe, and the greater 

 force of the wind. 



ado. That in the fecond obfervation, the evaporation was four 

 times greater than in the firft, though the temperature was 5* 

 lower and the hygrometer 3 degrees higher, yet the faturabilities 

 at the refpedive temperatures did not differ much, as may be 

 feen by the fore'^oing table, and the force of the wind was much 

 greater during the fecond obfervation. 



3tio. That in the third obfervation, the evaporation was by 

 far the grer<teft, though the force and duration of the wind were 

 (at leaft to appearance) exadly the fame as in the fecond obfer- 

 vation, becaufe the heat was 16" higher, and the hygrometer 4 

 degrees lower in the fecond obfervation. 



Thus 



