10 EE. Loomis—Observations of the U. S. Signal Service. 
the warm air, but it is remarkable that so few such cases 
occurred, and it will be noticed that a difference of temperature 
of at least 45° between Pike’s Peak and Denver often contin- 
ued from day to day for a long period. In May, 1874, it con- 
tinued for sixteen successive days, and in April, "1874, it con- 
tinued for nine successive days. Hence it may be inferred that 
during these periods there was no Seat uprising of the warm 
air, and descent of cold air. I think we may hence infer that 
dry air even when greatly heated, has but little ascensional 
Temperature on Pike’s Peak higher than at Denver. 
PrKE’s PEAK. DENVER. 
1873. |Tem.jhum.| Winds. |Clouds./| Tem. | Diff.|Barom./hum.| Winds.|Clouds, 
1|Noy.28.1 6°| T6/W. 40 4 0°} 6°|—"09 | 71 |Calm. | 0 
2|Dec. 20.1 4 50 |W. 20\4 N.W. 2 2 ,+°06 | 74 |Calm. 1 
3 28.1) 41 25 /W. 610 27 1.14 | —-07 | 63 |S. 3} 0 
4\Jan. 4.3 1 12 18)0 —4 5 | +°20 | 4718S. 6) 0 
5.1] 10 20 IN 30) 0 8 2} +°07 | 66/8. 6| 0 
6|Feb. 26.3 | 22 39 |W 32/0 13 9 | +°16 | 62 {S. 4| 0 
7 14.1 5 48 18) 2 14 1 | +°17 % 5| 0 
8 1.3 0 70 40/0 5 6 | +°25 | 26 |S. 5) 0 
9 19.1 6 52 |N. 6/0 5 1 | —03 © Bie | 
10 29.1] 5 75 |W. 15|0 4 1 | +°05 | 74 |IN.E. 6) 0 
1875 ; 
jljJan. 8.1/—2 |100|S.W. 22 Fog. —10 8 | +°1 [7% |N.E.12) 4 
12 8.2} 0 |100/)W. 42) Fog. —14 | 14 | +°28 /100 |N.E. 5] 4 
12 9.1/—18/ 100 /S.W. 38/2 —23 5 | +'29 |100 |Calm. | 0 
14 12.1 |—5 | 100/S.W. 14 — 8 3 |—‘1l1l {100 |N. 6) 4 
af. 12.2|—2 |100|S.W. 24/4 9 7 |—'04 |100 |N.E. 8} 4 
le 12.3 |—12} 100 |W. 32) 4 —15 3 | +°04 |100 | E. 4| 2 
Vl’ 13.1|—11}100/S.W. 36/4 —22 | 11 /4+-02 |100 |S.E. 4} 1 
1§ 13.2 }—2-|100|S.W. 24) Fog. —Il11 9 | +-06 Y.E. 6; 4 
1¢ 13.3 3 1100|S.W. 38/F 10 7 | +08 v.E. 5).3 N. 
2 14.1 1 | 100 |S.W. 0 —14 | 15 | +°15 |100 |S.E. 2) 0 
14.2 8 |100/S.W. 28) Fog. — 4]12|—-06 | 64 |N.E. 4] 1 W. 
27 14.3 5 | 100|S.W. 45) Fog. 1 4 |—-21 | #1 |N.E. 3] 3 W. 
2: 15.21 12 |100)8. 40) Fog. 10 2);—°07 | 17 |N.E. 8] 4 
16.2] 15 | 100 |S.W. Fog. 10 6.440141 58:1 Ne.) 3) 2°. 
26 16.3} 11 | 100/S.W. 55) Fog 7 41+°08 | 77 |Calm. | 2 
2€ 17.1} 10 | 100/58. 20) Fog. 1 9 |—-02 | T1 IN 6} 2 
27 17.2} 16 | 100/S. 42! Fog. 4/12 |—03 | 74 IN. 8 4 
28 18.1] 11 00 |S.W. 20 Fog. 1.4510} 4°12 | TL. N 1, 0 
29 18.2} 15 | 100/W. 35) Fog. 14 1 | +°03 | 63 IN. 214 W. 
30 18:3} 13°} % V. 20) Fog. 12 1 | +°05 | 61 3] 3 W. 
31 19.1} 10 | 100|W. 1 9 l 00 | 57 |S. 6| 0 
1877 
32\Jan. 11.3) 7 |100/|S.W. 15/4 2 5 | +:'05 |100 |N.E. 5) 4 
12.1 2|100\N.W. 8 Fog. — 6 8 | +°0 81 |Calm. | 0 
12.3} 8 |100|S.W. 8/Fog. 7] LL) +10} 77 5| 0 
35 13.3 00 |S.W. Fog. i 6 |—02 | 72 iS. 1; 0 
36 15.3/—5 | 100/S.W. 32)4 —10 5 |— 16 | 17 21 0 
37 18.1 OIS.W. 46/2 S.W. 0 0} +°05 | 85 {Calm | 0 
38 22.3} 11 | 76 |W. — 6} 16}+-19 | 8218S 56) 0 
241% 41S.W. .26)3 0 Ti+: 85 |S. 4, 0 
