92 K. Loomis—Observations of the U. S. Signal Service. 
the American Continent somewhat similar to that which prevails 
in winter over nearly the whole of Asia, but much inferior in 
amount. This area is however apparently divided into three 
subordinate areas of maximum pressure, one having its center 
near Salt Lake City; another near Yankton, and a third near 
Atlanta in Georgia. 
I next made a similar comparison of the barometric observa- 
tions for the month of July, and the results for the mountain 
stations are exhibited in the following table. 
Temperature. | Reduc. tos.lev.| Mean barom. 
Stations. : " , ig.S. i 
ations. | station| ase. | $46 | Gamp-| Sigs: | Gop 
Santa Fé 69°13 | 70°31| 654 | 6-35 | 29-898] 29-71 
ver 73-00 | 70°24| 5°22 | 4-92 | 30-105] 29°80 
Cheyenne 69°45 | 70°34| 5°94 | 5-71 | 30°098| 29°87 
Salt Lake City | 76°60| 67:24] 4°33 | 4°22 | 29°978) 29°87 
Corinne 76°20 | 67°19| 4°25 | 4°13 | 30°028| 29°91 
Virginia City 65°33 | 69°67| 5°48 | 5°20 | 29-822) 29°54 
Fort Benton 7347 | 65°33! 2°90 | 2°66 | 29-965| 29°72 
Column 2d shows the mean temperature of each station for 
the month of July according to the observations of five years; 
column 3d shows the temperature at the level of the sea directly 
under each station, estimated in the manner before indicated ; 
column 4th shows the reduction to sea-level adopted by the 
Signal Service; column 5th shows the reduction to sea-level 
computed by Dunwoody’s Tables; column 6th shows the mean 
pressure for each station according to the Signal Service obser- 
vations; and column 7th shows the mean pressure corrected by 
the reduction given in column 5th, 
It will be noticed that in four of the seven cases in the pre- 
ceding table the temperatures in column 2d are greater than in 
column 3d, and the average of the temperatures in column 2 
aod. Thi 
the same as that actually observed at Salt Lake City, the 
reduction of the barometer to sea-level will be 0-04 inch less 
