The work remaining to be performed by the division under the direction of the chairman of the board was as follows: 1. The completion of the survey of the line of highlands around the sources of the Rimouski, filling up the gap left in former surveys in the line of boundary claimed by the United States. 2. The survey of the line of highlands rising from the northern side of the Bay of Chaleurs at its western extremity from the point visited and measured in 1840 to its connection with the line surveyed in 1841 in the vicinity of Lake Metis. 3. The astronomical determination of the longitude of one or more points in the surveyed lines, in order to the compilation of a geographical map of undeniable accuracy. The party, which was dispatched at the earliest possible period, having been recalled by a special messenger as soon as the signature of the treaty of Washington was made known to the commissioner, no more than the first of these objects was attempted, and some of the observations that would have been considered necessary to make this survey useful as evidence in case of a further discussion of the subject of boundary were not completed. The expedition has, however, obtained for its results an accurate survey of the Green River of St. John from its mouth to the portage between it and the South Branch of the Katawamkedgwick, a survey of that portage, and a careful chain and compass survey of the highlands surrounding the sources of Rimouski. The first of these is connected with the survey of the river St. John made by Major Graham; the last was united at its two extremities with stations of the survey of 1841. Throughout the whole of the surveys the latitudes were carefully determined, by the methods employed during the former years, at a sufficient number of points. The longitudes have been estimated by the use of chronometers, but the sudden recall of the party left the latter part of the task incomplete. Any defect arising from the latter cause may be considered as in a great degree compensated by the connections referred to with the work of Major Graham and the surveys of the previous years. The party left Portland to take the field on the 18th June, and reached the Grand Falls of the St. John on its return on the 25th August. The surplus stores, with the boats and camp equipage, were stored there, and were afterwards transferred to the parties of the two other commissioners. A map of the operations of this division was placed on file in the State Department on the 27th December. The distance surveyed along Green River from its mouth to the portage is 57 miles, the length of the portage 5-1/2 miles, the distance measured in exploration of the remaining portion of the boundary claimed by the United States 61-1/2 miles, making in all 124 miles. II. The parties under the direction of A. Talcott entered upon their field duties about the middle of September, and completed that branch of the service by the 5th of November.