From the head of the Ouelle to the Temiscouata portage—­         Feet
The maximum height is                                         2,231
The minimum height is                                           853

From the point where the line first crosses the Temiscouata
portage to Mount Paradis—­
The maximum height is                                         1,983
The minimum height is                                           906

From the Temiscouata portage to the head of the Abagusquash—­
The maximum height is                                         1,510
The minimum height is                                           676

From Abagusquash to the Rimouski Lake—­
The maximum height is                                         1,824
The minimum height is                                           651

From the Rimouski Lake to the northwest angle—­
The maximum height is                                         1,841
The minimum height is                                         1,014

The greatest elevation of the whole of the third part of the
American line, therefore, is                                    2,231
The minimum is                                                    651

The termination of the exploring meridian line falls into this part of the American line.  Its height of 1,519 feet was determined by two separate observations, compared with others taken on Lake Johnson.  The height of the latter was calculated at 1,007 feet from a series of observations continued for seventeen days, and is believed to be as accurate as the method of the barometer is susceptible of.

This height of the termination of that line is estimated by Messrs. Featherstonhaugh and Mudge at no more than 388 feet, and that of the lake at no more than 363.  In this estimate they reject the indications of their own barometers, because the results of them would have contradicted the previous impressions which seem to have governed all their operations, viz, that the point claimed by the United States as the northwest angle of Nova Scotia is not in an elevated region of country.[34]

[Footnote 34:  A continuous line of leveling was carried by one of the parties of Major Graham’s division, by means of two spirit levels checking one another, from tide water at Calais, in Maine, to the monument at the source of the St. Croix, and thence along the true meridian line to its intersection with the river St. John.  The surface of the St. John at this point of intersection was thus found to be 419-1/2 feet above the level of mean tide at Calais.  The basin of the river immediately above the Grand Falls may be stated as of the same elevation in round numbers, as there is very little current in the river between those two points.]

On the third part of the British line from the sources of the Aroostook to the Grand Falls of the St. John no height is reported as measured by the British commissioners which exceeds 1,050 feet, while the greatest height on their profile is 1,150 feet.  The minimum height on their profile, excluding the Aroostook at its mouth and its intersection with the meridian line, is 243 feet, and the mean of the numbers entered by them both on their map and profile is 665 feet.