I 3^3 ] 



the temperature of air in a tranquil ftate, and the points from 

 which the wind blew, but having no hygrometer I did not ex- 

 amine its faturability. The veflel was the fame which I em- 

 ployed in meafuring evaporation already defcribed ; its furface 

 twenty-fix fquare inches, the depth of the water one inch. 

 The time of expofure commonly five minutes. The water was 

 ftieltered from the fun, and almoft always one or two degrees 

 colder than the air. A thermometer was left in the water and 

 compared with another fufpended in the air and fhade clofe 

 by it. The experiments were made at two o'clock in the after- 

 noon ; I fhall here ftate a few : 



Bar. 



