PROFILES ACCOMPANYING THE EEPORT. 15 



determined upon his survey. The altitude of the fort, resulting from our observations, is 4*76 

 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 

 that 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. 



