PARTIAL RESULTS OF EXPLORATION, 
463 
Meteorological Observations at stations on the route—Continued. 
IL.—From register kept under the direction of Lieutenant John Mullan, U.S. A. Determination of the height of Cantonment 
Stevens. 
Barometer. 
Mean height of 
column, 431 
observations. 
26. 134 
‘Mean of redue- 
tions to the 
freezing point. 
26. 102 
Mean tempe-| Height. 
rature of the 
air. 
° Feet. 
38. OL 3,754 
Remarks. 
The calculation has been made by referring the station to the level 
of the sea in the same latitude, where it is assumed that the cor- 
rected height of the barometrical column is 30 inches, and the 
temperature of the air 55°. No corrections have been applied 
except those for the temperatures of the air for the latitude, and 
for the elevation of the upper barometer. In making the re- 
ductions to the freezing point the tables for barometers with 
brass scales have been used. The barometer employed in the 
observations was Green’s open cistern, which, it is thought, has 
its scale on glass. The observations were generally taken daily 
at 7 a.m., 2 p. m., and 9 p.m. The following are, however, 
wanting, viz: In January, at 7 a. m. on the Ist, 2d, 7th, and 11th; 
at 2 p. m. on the Ist, 10th, 11th, and 30th; and at 9 p. m. on the 
Ist, 6th, 10th, and 29th. In February, at 2 p. m. on the 8th, and 
at 9 p.m.on the 8th and 9th. In April, at 2 p. m. on the 15th 
and 23th. And in May, at 2 p.m. on the Ist and 20th. The 
observations, as recorded in the register, at 9 p. m. on the 28th 
of April and the 14th of May, and at 2 p. m. on the 15th of May, 
are, respectively, 26.690, 26.900, and 26.880. From the general 
range of the barometer at the time, it is thought 25.690, 25.900, 
and 25.880, were intended. 
III.—Copied, by permission, from a register kept at Fort Steilacoom, W. T., by Dr. J. M. Haden and Dr. George Suckley, 
U.S. A., for the medical department. 
Extreme temperatures. 
Mean temperatures. 
Date. 
Sunrise.| 9 a.m. | 3p. m./9p. m. 
1853. ° ) © @ 
October.-.| 45,25 | 55.58 | 62.32 | 51.19 
November.) 40.2 | 46.7 | 50.43 | 43.73 
December.) 38,74 | 44.30 | 51 44, 45 
1854, 
January...| 24.64 | 29.96 | 37.80 | 30.03 
Monthly 
mean. 
44.63 
44.74 
31. 38 
Upper. 
59 
60 
58 
Day and hour. 
30th, 3 p. m. 
2d, 3d, & 5th, 
2d and 29th, 
Remarks 
Day and hour. 
There were 6. 93 inches of rain. 
There was hoar frost three 
times, and frost once, during the 
month. 
| 14th, sunrise.) There were 18. 41 inches of rain. 
Hoar frost twice; one strong 
frost. 
There were 4. 42 inches of rain. 
14 inch of snow at sunrise on 
the 23d. There were hoar frost 
three times, frost once, and hard 
frost four times, during the 
month. 
4th, 3 p. m. 23d, sunrise. 
23 | 20th, sunrise. 
3 p.m. 
There were 8. 69 inches of rain; 
24 inches of snow at sunrise, 
and ice 14 inch thick on the 
4th. Snow latter part of the 
10th; 2% inches of snow at sun- 
rise, and snow at intervals, on 
the llth. Light showers of 
snow at intervals on the 12th. 
Six days when there was frost. 
—1 | 22d, sunrise. 
3 p.m. 
