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] [Footnote 35: Since the above was written Major Graham's map and the computations of the barometric heights above alluded to have been completed. This map exhibits in their proper positions the numerous altitudes which were determined throughout the country watered by the Aroostook and its principal tributaries, extending laterally to the heights which bound the basin of that river on either side; along the due west line traced in the year 1835 by Captain Yule, of the royal engineers, between Mars Hill and a point near the forks of the Great Machias River; along and in the vicinity of the road recently opened by the State of Maine from Lewis's (a point in latitude 46° 12' 20", between the head branches of the Meduxnikeag and the Masardis or St. Croix of the Aroostook) to the mouth of Fish River, in latitude 47° 15' 13", being a distance, actually measured, of 79 miles; and along the new military road, embracing 40-1/2 miles of the distance from Fort Fairfield to Houlton and including the adjacent heights on either side. The number of elevations within the territory watered by the Aroostook and claimed by Great Britain that have thus been carefully measured amounts to upward of 200. This survey shows that although the prominent eminences which occur along that portion of the "axis of maximum elevation" of Messrs. Mudge and Featherstonhaugh which lies between the mouth and the source of the Aroostook correspond very nearly in height and position by our measurements with those reported by themselves, yet these eminences are separated one from another by spaces of comparatively low and very often swampy country, so extended as to preclude the idea of a continuous range of highlands in the direction represented upon the map of those commissioners.