394 



REPORT — 1866. 



Table VII. — Showing the Yariation of the Hygrometric condition, of the 

 Air at every 100 feet of height. 



TWEK-TY-SIXTH AsCENT. 



The temperature of the dew-point increased on ascending to the height of 

 900 feet, then decreased, the air becoming drier, or the degree of humidity 

 less ; at heights exceeding 1200 feet, the degree of humidity was nearly the 

 same as at heights less than 900 feet. On descending, the temperature of the 

 dew-point decreased, and the air was driest at aboiit the height of 1000 feet ; 

 at heights less than 1000 feet the temperature of the dew-point increased, 

 and the degree of humidity increased till the ground was reached. 



T^VENXT-SETENTH AsCENT. 



