482 REPORT—1863. 
1000 feet, for a decrease of temperature of 1° with a cloudy sky ; from these 
we see that up to 1000 feet the average space is 222 feet, the spacefor each 1000 
feet increasing till at 20,000 feet it requires fully 1000 feet for a change of 
1° of temperature. 
In the last column the same results are shown for clear, or nearly clear sky, 
and they show that a change of 1° takes place for an average increase of 139 
feet in the first 1000 feet ; this space gradually increasing to fully 1000 feet 
at heights exceeding 23,000 feet. 
By comparing the numbers in columns 24 and 27 together, the different 
spaces required to be passed through for a decline of 1° of temperature in the 
two states of the sky will be readily seen: up to 20,000 feet it is generally 
necessary to pass through a much larger change of elevation for a decline of 
1° of temperature than with a clear sky; at heights exceeding 20,000 feet, 
there does not seem to be much difference in this respect between the two 
states of the sky. 
Croupy Sxy. 
By adding together successively the numbers in column 22, we shall fin 
the whole decrease of temperature from the earth to the different elevations ; 
the results with a cloudy sky are as follows :— 
feet feet ° feet. 
From 0 to 1,000 the decrease was 4-5, or 1° on the average of 222 
4 2,000 Ds 8:3 ‘J 241 
- 3,000 he 11-9 ¢ 253 
: 4,000 i 15°3 iS 262 
ns 5,000 fe 18-6 * 269 
g 6,000 x 21:8 4 275 
Ks 7,000 S. 24-4 3 287 
p 8,000 i 26°8 $ 299 
“ 9,000 3 28-8 5 313 
» 10,000 ; 30:3 fi 331 
4 O08 fi 31:7 6 348 
» 12,000 i 33-0 4 365 
yak | LOD 5 34:3 381 
» 14,000 fs 35-5 ih 395 
» 15,000 ; 36-7 “3 409 
» 16,000 : 38-0 i 422 
yond LBD Ps 39-2 i 434 
» 18,000 2 40-5 : 445 
» 19,000 41-9 ua 455 
» 20,000 Es 42-8 hi 468 
» 21,000 - 43-9 A 479 
» 22,000 i. 44-7 is 492 
pee eigen the 45-5 506 
? ” 
These results, showing the whole decrease of temperature of the air from 
the earth up to 23,000 feet, differ very considerably from those with a clear d 
sky, to be spoken of presently. The numbers in the last column show the 
average increment of height for a decline of 1°, as found by using the tempe- 
ratures of the extremities of the column alone. To 1000 feet high the average 
js 1° in 222 feet, increasing gradually to 1° in 300 feet at 8000 feet high, — 
and to 506 feet at the height of 23,000 feet. 
Crear Sry. 
By adding together the numbers in column 25 in the same way the 
following results are found :-— 
