ON FIVE BALLOON ASCENTS IN 1863. 
in every 1000 feet of elevation up to 29,000 feet. 
481 
July 21. Mean. General Means (omitting July 17, 1862). 
State of the Sky. 
Cloudy. Cloudy. i Clear. 
peel Ne aacs | cae 
wb eh Cloudy. Leni! } Clear. vitae ve Niuaiies Passed jungies Pased 
ss 3 3 ments. ments. || Mean. caer decline | Mean. eanent! ae 
8 2 2 ments. | of 1°, | ments. | of 1° 
< a a 
5 3 7 e > A feet. feet. 
oats | ea a ae a wa ote Nes we ORS I | 1250 
bor ae tee oo o'9 I IIII 
oon os soe tee te ro I 1000 
ce ses Ae tee oct TCs A ABY 1000 
aoe vee tee tas tee tee I'l 2 gir 
eee ee bc ts oo eee i] 183 2 771 
o'8 2 se oc) | eRORS Z| FAO) 170 4 | 1000 
08 2 08 3 || os Zataroyy | 17x 7 gli 
‘ I'l 2 I'o 3 I'l 2 gir |} 12 7 333 
o'9 2 o'9 3 °"9 2 909 1°3 7 771 
14 2 I'2 3 || 14 2 715 1's 7 666 
13 2 rg 3 |e deg 2 G(s fi Vy 7 538 
io 2 18 3 12 2 833 I'9 7 526 
- 1°3 2 || 19 q las 2 771 2° 7 500 
12 2 || 2-7 3 || a2 2 833 || 2°71 7 477 
elon 1'2 2 2°1 3) ima 2 833 22 9 455 
ous 1°3 2 22 Syeatl lS 2 77% 24 9 417 
seueds 1°3 2 2°2 3) I eleg 2 771 2°5 9 400 
o |i eee 1*4. 2 2°3 4 eas: 2 715 2a Il 400 
os [iisee, | oe I's 3 2°0 3 b a 2 667 2°5 10 400 
“Sikere 2°0 3 past 2a 20 2 500 2°5 10 400 
. “lethal tae 3 2°0 2 || 24 2 417 |i 2°5 I0 400 
3e) |, «com Oe 2°6 3 2° 2 2°6 3 385 || 2°6 10 385 
vee | one . ches 5 1'9 Bi naa 5 313 2°6 12 385 
wo fans | oe a5 5 2°0 2 a3 II 303 || 2°7 7 374 
Somes. | ose 370 8 1°8 I 34 18 294 3°2 3 312 
12) 2°6| ... || 3°0 10 2°0 I 3°6 | 20 278 || 4'0 7 250 
BoE 455 |<. 3°4 12 a°3 I 38 19 264 || 5°0 6 200 
mvs (etee | 2°S || 4:4 3 7-2 I 4°5 15 222 72 6 139 
15. 16. 17. 18. 19. 20. 21. 22, 23. 24. 25. 26. 27. 
ginning of the experiments, and these vary from 11 to 20 up to 5000 feet, 
and the results must therefore be very nearly true. 
The numbers in column 26 show the total number of experiments which 
have been made at the different heights with clear or nearly clear skies; they 
vary from 4 to 12 up to the height of 23,000 feet, and there can be but little 
doubt that the numbers in column 25 are closely approximate to the true 
numbers up to this elevation; above 24,000 feet, the number of experiments 
are too few to speak with any confidence. 
The numbers in column 22, showing the decrease of temperature for 1000 
feet increase of elevation with a cloudy sky, differ very much from those in 
column 25, showing the decrease for the same space with a clear sky, the 
former being much smaller up to the height of 18,000 feet ; at heights greater 
than 19,000 feet the differences between the results in the two states of the sky 
are small, 
i numbers in column 24 show the average increase of aad at every 
: I 
