ON FIVE BALLOON ASCENTS IN 1863. 505 
At heights exceeding 10,000 feet there have not been sufficient determina- 
tions to deduce any satisfactory results, but up to 7000 feet there have been 
sufficient to speak confidently, and the result is that the dew-point, as found 
by the dry- and wet-bulb thermometers, is worthy of every confidence ; for the 
differences, as shown above, are quite within the error of observation. 
Heicurs AND APPEARANCES OF THE CLOUDS, AND APPEARANCES OF THE SKY, 
March 31. 
There were detached cumuli before starting; blue sky. 
At 4" 21™ 308 p.m., at 3698 feet. Very misty; a few beautiful cumuli. 
At 4" 27™ p.m., at 6251 feet. Earth appears dotted with cumuli clouds ; 
blue lines of light crossing each other at right angles. 
At 4" 52™ p.m., at 17,400 feet. Horizon not visible; a mass of clouds to 
the N.W. so distinct that its boundary-line can be traced. 
April 18. 
At 1° 19™ p.m., at 2575 feet. Misty. 
At 1" 21™ 10° p.m., at 4392 feet. Cumuli on the same level as the bal- 
loon; misty. 
At 1° 25™ 30° p.m., at 7180 feet. Thick mist; almost a fog. 
At 1° 30™ p.m., at 11,055 feet. Above the clouds; sea of clouds below. 
June 26. 
From 1" 17™ 458 p.m., at 11,204 feet, to 1" 25" p.m., at 15,598 feet. In fog. 
At 1" 32™ 30° p.m., at 17,144 feet. Clouds above us. 
At 1" 34™ p.m., at 17,479 feet. In cloud. 
At 1° 36™ p.m., at 18,291 feet. In a wetting fog. 
At 1" 37™ p.m., at 18,560 feet. Cold dry thin fog. 
At 1° 39™ p.m., at 19,018 feet. Just above cloud ; cirri far above, clouds 
all round on the same level as the balloon. 
At 1" 41™ 45° p.m., at 19,909 feet. Evidently three layers of clouds. 
At 15 43™ p.m., at 20,648 feet. Rain-cloud on our right; two nimbus 
clouds near us and on our level. 
From 1° 43™ 30% p.m., at 20,648 feet, to 1" 46™, at 21,266 feet. In fog. 
At 1" 50™ p.m., at 22,053 feet. We looked round at the faint blue sky 
covered with cirri, and estimated its height to be many miles ; the atmosphere 
thick and misty. 
At 1" 54™ p.m., at 22,664 feet. Cirri clouds above ; sky faint blue. 
At 1" 54™ 40° p.m., at 23,143 feet. Above the clouds, but not free from 
mist; the clouds present no fine views, few peaks, and all is confused and dirty- 
looking. The blue sky is of the same paleness as seen from the earth. 
At 1° 5™ p.m., at 22,168 feet. The sky is faint blue, and the clouds are 
all below. 
At 2" 2™ p.m., at 20,167 feet. The sun seen faintly. 
At 2" 2™ 45° p.m., at 20,167 feet. In fog. 
From 2” 4” 30° p.m., at 19,367 feet, to 2" 5™, at 19,901 feet. In fog. 
At 2" 6™ p.m., at 19,963 feet. Faint gleams of light. 
At 2" 6™ 20 p.m., at 20,025 feet. Fog above and below, none near us; 
faint gleam of light. 
At 2" 7™ 30° p.m., at 20,025 feet. Drops of water falling from the bal- 
loon on my note-book. 
