94 E. Loomis—Observations of the U. S. Signal Service. 
whose altitude exceeds 1,200 feet, the reduction was also 
determined by my tables contained in Guyot’s collection of 
Hypsometrical Tables as published by the Smithsonian Institu- 
tion, pp. 52-8. The observations at Mt. Washington and Pike's 
eak, have not been employed in these comparisons. 
The following table shows the data for the month of January. 
Column 5th shows the mean height of the barometer as deter- 
mined at each of the stations; column 6th shows the mean 
temperature of each station and differs slightly from the num- 
bers given on page 90, as it includes the observations of an 
additional year; column 7th shows the estimated temperature 
at the level of the:sea directly under each station, and differs 
woody’s Tables (Report 1876, pp. 354-860), and for stations 
Is 
January observations. 
Temperature. Reduc. barom. 
‘Stations. | Lat. | Long. | Altt | Mean Diff. 
= tude. | barom. Station.| gea lev Big Looms. 
Santa Fé 35°7 | 106-2} 7000 | 23-196] 28-4 | 462 | -189 | -198 | —009 
Dodge City | 37°6 | 100°1| 2486 | 27-454] 26-1 | 39°3 | -176 | *181 {| —"005 
Denver 39°7 | 105°1| 5269 | 24°721| 26°1 | 36°5 | -211 | -234 | —°023 
N. Platte 41'1 | 100°9| 2838 | 27-093] 18°3 | 30°0 | -249 | -255 | —°006 
Cheyenne 41°2 | 104°7| 6057 | 23°922| 23°6 | 32°3 | -185 | -193 | —*008 
Salt Lake C.| 41-2 | 112°0| 4362 | 25-660] 29-1 | 38:1 | -271 | ‘288 | —"017 
Yankton 42-7 | 97°5| 1275 | 28809] 11°8 | 24:3 | -288 | -290 | —-002 
Virginia C. | 45-3 | 112-0] 5694 | 24:168/ 17-9 | 29-1 | -135 | -159 | —°024 
Bismark 8 | 100°6| 1706 | 28-228} 5:7 | 180 | -214 1 -216 | —002 
somewhat from the numbers given on page 90 for the reason 
