4.92 REPORT—1863. 
Taste VII. (continued.)\—ELEVENTH ASCENT. 
Humidity of the Air. 
Ascending. Descending. 
Height, in feet, 
above the mean 
Tempe- -, | Degree Tempe- +, | Degree 
level of he sea [Betwee circum rare of Elastic *f.- | Betee circum. rature of UAH Sr 
times, | stances. the. Ce") vapour. hurl || times. | stances. (the se-| vapour. | hum 
June 26. Clouds 5 in. é in. 
. still 
above; : és Clouds : 
23000 jana fp) wet 5S) ei above.| 995 
bluesky. 
22000 Tattoo 2°3| *O40} 34 2'0 
21000 B+)_18-5] -o18| 18 Fog. |— 4°5| °036| 26 
20000 —15°5 ‘O21 19 ; Ewe) "054 38 
In fog; Faint 
19000 ei —17°5|} ‘oIg|) 15 geet 370] "O50} 32 
18000 . [eeegs} 90} '065| 34 | FF 30] "050| 32 
a [EBeSs g 
as seg60 ° B 
&  |Coldd “o| ° > Al 
17000 ce ay A) 1 10°5| 069) “46 
16000 ic a we 20°5| ‘110) 68 ~ | Rain. | 15°5| *088| 49 
15000 £ ries 24°5| °132| 78 3 —| 14°5 084) 45 
14000 | COEF ny 31°0| *174]| 100 Be 22°0| *118| 63 
> n log. ° qd °o . . 
13000 a B-| 30°5 170} 100 4 Snow.| 24:0] *129| 69 
| Sun Ps 
12000 = | seen 28:0], °153 |. .9x » 23°0| *123| 65 
a faintly. 3 
11000 EZ |infog;| 220| ‘118| 68 5 20'0| *108| 58 
10000 = |thinrai | 16°0/ *ogo| 46 PF |———|_ 12'0| 074] 59 
gooo ~ TLOy OTL 315 150} ‘086} 44 
8000 1075} ‘o069| 57 S| 15°5| -088) 44 
7000 ¥5°0| 086] 34 ae 18°5| ‘100} 43 
6000 2AT Gili os 2ueraS Sx 22°5| “I20] 54 
5000 34°0| “196| 69 5& | 260/ ‘141) 53 
4000 410} °257| 67 S62 | 340] *196| 68 
3000 45°0| °299| 68 & = 39°5| °242] 72 
2000 45°0| °299| 57 @f& | 43°5| *283) 68 
1000 Very 4870)|. °33'5)1 © 55 | SS) -48°0)| © *4qiil 6s 
300 dark. 50°0 361 56 5 aia wes eS, 
) eee swe |.) eee 55°0| °433] 66 
June 26.—The temperature of the dew-point was 50°, and on leaving the 
earth it declined less rapidly than the temperature, so that the humidity in- 
creased; after passing above 4000 feet the dew-point declined rather quickly 
to 6000 feet, where its rapid decline was checked, but continued to decline to 
8000 feet; it was here as low as 103°; it was 11° at 9000 feet, and then in- 
creased, momentarily approaching that of the air; and at 12,700 feet, having 
passed through rain at 10,000 feet, these two temperatures were alike, and 
the air was saturated with moisture, and continued thus to 14,200 feet high ; 
it then separated, and whilst passing through a dry fog at 15,000 feet, whilst 
the air was increasing in temperature, the dew-point decreased; on passing 
out of cloud at 18,000 feet the air became dry, and from 20,000 feet to 23,000 
feet the dew-point was from 30° to 40° below that of air; at this time rain- 
clouds were at the same height, and at 23,000 feet the air again was so moist, 
that the difference between these two temperatures was 6° only. The degree 
