TABLE OF ALTITUDES. 613 
List of Altitudes of the line from Columbia Barracks to Fort Okinakane. 
T T 
} 
Camp. Barometer. | Thermometer. Altitude. 
e Feet. 
1 74.6 157, 2 
2 79.3 276.7 
3 78. 6 255.5 
4 72.0 553, 5 
5 68.5 702.7 
6 59.3 430.0 
7 59. 7 417.0 
8 56.9 312.8 
9 60.0 615. 4 
10 58.7 752.5 
11 57.7 | 2840.1 
12 53.3 } 3049. 0 
13 48. 0 3923. 7 
14 53. 0 2430.8 
15 66.0 1930, 3 
16 65. 0 1789, 1 
17 55.4 2662.5 
18 58,7 2168. 7 
19 63.8 1331.4 
20 55.3 1921.7 
21 63.5 1777. 6 
22 51.4 1782. 3 
23 51.7 2198. 6 
24 61.5 1732. 4 
25 74.5 756.5 
26 61.2 968, 7 
27 53.0 781.6 
28 59. 2 754, 1 
29 54. 0 738. 8 
30) 57.9 B34. 7 
31 43.7 2804.5 
32 40.0 1960. 4 
33 56.6 2275, 6 
34 : 51,7 1048, 8 
35 53.5 624.3 
36 59, 0 745. 2 
37 53.5 808, 5 
33 51.7 811.1 
ERRATA. 
In table of latitudes and longitudes, page 456, for latitude of Fort Colville, 46° 36/ 16'’, read 48° 36/ 16”. 
In table on page 568, for mean difference of readings of wet and dry thermometers, August, 1854, for 15°.7, read 16°.7. 
