4.66 REPORT—1862. 
Taste VII. (continued.) 
Hygrometrical results. 
Ascending. Descending. 
poe in feet, = 
above the mean 
level of the sea. |Between| ,. Tempe-! plastic | Degree || Between| Tempe-| pastie | Dearee 
what | teu ature OF force of | auChi. || BBE | Stance Ite dew-| {2% Of] tuum. 
times, A point. vapour, dity. times. point. vapour. dity. 
August 20, spe c= 
5000 x A as fia S Be lesti: 
4.000 a 7 46°2| °313| 88 Se 44'2| *290| 84 
3000 at 48'9| °346| 84 pb F 46°6| °318| 83 
2000 a goo| 361) 75 3S 4g'o| °349| 82 
1000 Ere 52 3 "393 e : oy 5r7| °384| 81 
° =| Zo}; ° B 
Zz” 55 3 = 
5000  ||Incloud| 42°3| *270/ 88 
4000 ga) -: 44°2| ‘290| 83 
gooo (kam ... 46°0| °311| 77 
zooo ea &) .. 50°5| °367| 80 
. 1000 PS ioe 517} °384| 81 
° La 
point: the humidity increased from 53 at 7000 feet to 77 at 3500 feet, 
The balloon then ascended, and the dew-point fell to 37° at 8000 feet, and 
the humidity from 76 to 61. 
The dew-point then increased somewhat to 393° at 8500 feet, with a humi- 
dity of 65: from this elevation the dew-point decreased to 21° at 11,600 feet, 
with a degree of humidity of 51. The dew-point then turned to increase, and 
was 252° at 12,400 feet, giving a humidity of 57 at this elevation; it thende- 
creased gradually to 23° at 14,500 feet, and then rapidly to —83° at 20,100feet: 
the relative humidity was 59 at 12,400 feet, and 22 at 20,100 feet. Above 
20,000 feet a dry stratum of air was entered and no dew was deposited on either 
of the hygrometers, their bulbs being reduced to a temperature of —10°. 
In descending, the dew-point increased steadily to 14° at 12,000 feet, 
remained at this reading till nearly 10,000 feet, then increased rapidly to 343° 
at 8000 feet, and then gradually and almost uniformly to 57° on the ground: 
the degree of humidity increased from 31 at 18,000 feet to 36 at 14,000 feet, 
remained at this value to 12,000 feet, decreased to 28 at 10,000 feet and then 
increased to 77 at 4000 feet, and was 66:on reaching the ground. In this 
series a narrow stratum of nioist air was passed through between 1000 and 
2000 feet from the earth, and then another on passing through a cumulus 
cloud at the height of 3800 feet ; above this to 11,000 feet there was a con- 
stant decrease in the amount of water; the balloon then descended and the 
vapour increased steadily to 8000 feet, then a stratum of moist air was met 
with from 1000 to 2000 feet in thickness; from 6000 feet to 3500 feet on 
descending, and again from 3500 to 7000 feet on ascending, there was an 
increase and decrease respectively ; between 8000 and 9000 feet and be- 
tween 11,000 and 12,000 feet dry strata were passed; then for 2000 feet 
there was but little variation in the humidity of the air, above 15,000 feet 
there was a rapid decrease in the amount of vapour, till the air became very 
dry above 20,000 feet. In the descent one stratum only of moist air was 
passed through, viz. between 13,000 feet and 9000 feet from the earth. 
August 20.—Between 400 and 600 feet a dry stratum of air was pana 
then there was but little variation in the temperature of the dew-point, and 
the air was for the most part humid during the ascent, 
