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]
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.
It will therefore appear that if the profile of Messrs. Featherstonhaugh and Mudge be correct the lowest gap on the third part of the American line is about as high as the mean elevation of the part of the British line with which it is compared.
The line claimed by the United States therefore possesses throughout in a pre-eminent degree the highland character according to the sense at one time contended for in the argument of Great Britain, and is, to use the term of the British commissioners, "the axis of maximum elevation," the mean of all the heights measured upon it being 1,459 feet, while that of those measured on the line of Messrs. Featherstonhaugh and Mudge is no more than 1,085 feet.
It is regretted that the computations of the barometric and other observations for the determination of the heights of that portion of the country between the valley of the St. John and the sources of the Aroostook, explored by the division of Major Graham, could not be completed in time to be made use of for this report in the description of that portion of the line claimed for Great Britain by Messrs. Featherstonhaugh and Mudge. This delay has been solely caused by a want of reasonable time to complete this portion of the work, the commissioner having direction of the division charged with it having only returned from the field in the month of January.
Sufficient information is known, however, to have been derived from those surveys to justify the assertion that, instead of the strongly marked range of highlands represented by the British commissioners as constituting a part of their "axis of maximum elevation," the country in the vicinity of the Aroostook lying between its sources and the valley of the St. John is devoid of the character they have attributed to it. When properly represented upon a map it will appear as an extended undulating surface of moderate elevation above the level of the Aroostook River, sparsely interspersed with occasional detached elevations rising to heights of 600 to 900 and 1,400 feet above the level of the sea, but forming no continuous or connected chain whatever in the direction represented by the British commissioners, or that could be construed into the character of highlands such as are described in the treaty of 1783.[35]
In addition to the surveys upon the boundary line claimed by the United States, an exploring line was run under the direction of Professor Renwick, as is more particularly described in Appendix No. 1. This line extended to an eminence on the eastern side of Lake Matapediac, elevated 1,743 feet above the level of the sea. The views obtained from this eminence established the fact that a chain of highlands extended thence to the north shore of the Bay des Chaleurs. They are believed to terminate in an eminence, which from its imposing appearance has been called by the Scotch settlers at its foot Ben Lomond. This was measured during the operations of the summer of 1840, and found to rise from the tide of the bay to the height of 1,024 feet. This exploring line, coupled with the more accurate surveys, appears to establish the fact of the existence of a continuous chain of eminences entitled to the epithet of highlands from the north shore of the Bay des Chaleurs at its western extremity to the sources of the Connecticut River. Returning from the latter point, they exhibit the aspect of well-marked ranges of mountains as far as the sources of the Metjarmette. Thence to the sources of the Etchemin extends an undulating country whose mean height is 1,300 or 1,500 feet above the level of the sea. The boundary line is thence prolonged to the Temiscouata portage over well-defined ridges to the eastern side of Lake Temiscouata. At the sources of two of the streams which run into this lake the minimum heights of 651 feet and 676 feet have been observed.
With these exceptions, the sources of the streams which rise to the north of the Temiscouata portage and between the lake of that name and Lake Matapediac average more than 900 feet above the level of the sea. For the purpose of describing this portion of the line claimed by the United States, we may take this height of 900 feet as the elevation of a horizontal plane or base. On this are raised knolls, eminences, and short ridges whose heights above this assumed base vary from 300 to 1,300 feet. The more elevated of these are universally designated by the hunters who occasionally visit the country and the lumberers who search it for timber as mountains clothed to the summit with wood, which, in consequence of the rigor of the climate, attains but a feeble growth. They have an aspect of much greater altitude than they in reality possess, but their character as highlands is indisputable. This term, which the first English visitors ascribed without hesitation to the hills of New Jersey,[36] whose altitude is about 300 feet above the level of the sea, is much better merited by a group of eminences rising from 300 to 1,300 feet above a base itself 900 feet in height, and which exceed in elevation the well-known highlands of the Hudson River.
Not to rest merely on instances drawn from the language of those of English birth who first settled or traded on the coast of the present United States, there are in the immediate vicinity of the region in question a range of eminences the highest of which is no more than 1,206 feet above the level of the sea. These, on the authority of a distinguished officer of Her Britannic Majesty's navy,[37] are named the "highlands of Bic," and have long been thus known by all the navigators of the St. Lawrence who use the English tongue.
To sum up the results of the field operations of the commissioners: