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 Reading 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 

 tbat ours is the more reliable result. There are a few other discrepancies in altitudes deduced 

 from his observations and ours, but 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. 



