49{) 



FINAL RESULTS. 



Apr. n. 



Name of Station. 



Height above 

 Adopted Sea-level by 

 LoiiKitnde, ! 



East. 



Barometer. 



Boiling 

 Water. 



Notp:. — The apparent discrepancy in the relative height of 

 places near the sea-level arises principally from the fact that the 

 method of observation usually adopted is not sufficiently accurate 

 for the determination of Ioav elevations. The A^ariation in the 

 pressure of the atmosphere during the interval between the 

 observations made on different days at two or more stations, may 

 cause a discordance of several hundicd feet, unless a correction 

 be applied for the amoxnit of the variation. The only way to 

 obtain this correction is to have corresponding barometric obser- 

 vations statedly made near the sea, or at a station of known alti- 

 tude. By this means we obtain materials for correcting the 

 observed barometric readings, or of those deduced from the 

 boiling-point tliermomcter. In practice, liowcver, it has been 



