ON THREE BALLOON ASCENTS IN 1864 AND 1865. 



179 



dew-point 18°-4, showing a difference of ll°-6, which increased gradually to 

 12|° at 4000 feet; the air then suddenly became much drier, the degree of 

 humidity being 48 at 3600 feet, and the difference between the temperatures 

 of the air and dew-point was 164°. The air then became much more moist, 

 and continued so till the ground was reached. The most humid state was' 

 experienced at the height of 1000 feet from the earth. 



Table YTI. (continued). 

 Twenty-fourth Ascext. 



