452 REPORT—1862. 
These results differ considerably from those found in a cloudy sky, and 
doubtless the difference between experiments carried on under a cloudless 
sky at these elevations would differ still more. They do not at all confirm 
the law of gradation of temperature of 1° in 300 feet. 
Tur DECREASE OF THE TEMPERATURE OF THE AIR 
At heights exceeding 5000 feet. 
feet. feet. i e 
From 5,000 to 6,000 was 2-8 from 10 experiments, or 1 in 357 feet. 
33 6,000 33 7,000 39 2:8 33 33 32> 33 357 3? 
39 7,000 9° 8,000 99 2-7 ” 33 3? 99 370 3? 
bP) 8,000 39 9,000 39 26 33 ” bP) 3”? 384 ? 
> 9,000 ” 10,000 9 26 ”? 3”) ” 33 384 3”? 
3? 10,000 > 11,000 oF 26 3? ”? >> 99 384 >? 
3) 11,000 3? 12,000 9 2°6 99 bP. 3? 33 384 ”” 
», 12,000 ,, 13,000 ,, 25 ,, ” » » 400.--,, 
9 13,000 ” 14,000 3) 2:2 2) 33 Lh | 33 455 3 
” 14,000 ” 15,000 ” 21 ” ” ” ” 477 ” 
3) 15,000 3”) 16,000 9 21 3) ” bP) 39 477 33 
39 16,000 ” 17,000 39 33 Ped 33 527 39 
»> 17,000 ,, 18,000 _,, 556 ,, 
», 18,000 ;, 19,000 ,, 3 93! 370 ile a OE 
99 19,000 bes 20,000 9 39 9? 9 39 667 ” 
» 20,000 ,, 21,000 ,, z 39° day “29 Biple EC 
3? 21,000 2? 22,000 9? 2) 39 3) 771 3” 
55 22,000 ,, 23,000 ,, 
»» 23,000 ,, 24,000 ,, 
» 24,000 ,, 25,000 ,, 
», 25,000 ,, 26,000. ,, 
», 26,000 ,, 27,000. ,, 
»» 27,000 ,, 28,000 ,, ae tee ee 
” 28,000 ,, 29,000 _,, 08 ,, ” ” » 1250 ,, 
These results follow almost in sequence with those found with the partially 
clear sky, and together show that a change of temperature of 1° takes place in 
139 feet near the earth, and that it requires fully 1000 feet, for a change of 1°, 
at the height of 30,000 feet ; the intermediate heights require a gradually 
increasing space between these limits to its elevation, and plainly indicate 
that the theory of a decline of temperature of 1° for every 300 feet of ascent 
must be abandoned. 
By adding successively together the decrease due to each 1000 feet, we 
have the whole decrease of temperature from the earth to the different ele- 
vations ;— 
” ” 6 ADR) 95 
” ” ” 771 ” 
” ” ap «OOD ovigy 
” ” 9» 1000" ,, 
” ” »> 20005 :,, 
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ft. feet. a feet. 
From 0 to 1,000 the decrease was 7:2, or 1° on the average of 139 
2 2,000 # 12:5 me 160 
x 3,000 a alot i. 176 
os 4,000 iv 20:5 ss 195 
“ 5,000 ds 23-2 4 211 
ss 6,000 5 26-0 fe 230 
zn 7,000 sf 28-8 P: 243 
$5 8,000 s 31:5 af 254 
js 9,000 5 34-1 Ft 263 
