PROFILES ACCOMPANYING THE REPORT. 
15 
determined upon his survey. The altitude of the fort, resulting from our observations, is 476 
feet. No correction for abnormal error appears to have been applied to Gov. Stevens’ observa¬ 
tions ; and this omission would very naturally explain larger discrepancies. 
Our altitude of Fort Beading differs 157 feet from that of Lieut. Beckwith ; and as he had 
only six observations there, while we had a very large number, I think there can be no doubt 
that ours is the more reliable result. There are a few other discrepancies in altitudes deduced 
from his observations and ours, hut none that might not be easily occasioned by abnormal 
oscillation, for which he was unable to obtain any correction in this vicinity. The general 
agreement between the results of the two surveys, is highly satisfactory. 
