1. At as early a period as there was any probability of the country being accessible two engineers were dispatched from the city of New York for the purpose of exploring the Rimouski River. This had been crossed by the commissioner late in the previous season. It had been ascertained that it took its source much farther to the south than was represented on any map, and that at its head would be the greatest difficulty in the intended researches. It was, besides, considered necessary that skillful boatmen and practiced woodsmen should be engaged in Canada. These it was believed could be found in Quebec, and the chief of this detachment, with an appointment as acting commissioner, was directed to perform this duty on his route. This detachment accordingly left New York on the 22d May. On reaching Quebec it was found that the proper persons could only be engaged at Trois Rivieres. A delay was thus occasioned before this part of the duty could be performed. The detachment, however, reached Rimouski 4th June, where the snow was still found upon the ground and the river barely fit for the access of boats. No time had therefore been lost, and the reconnoissance of the river was successfully performed. The detachment, after passing all the establishments of lumberers, extended its explorations beyond the remotest Indian paths, and leaving its boats penetrated on foot several miles to the south of the highest point of the stream in which boats could float. In this progress through unexplored ground a lake wholly unknown was discovered. The results of this expedition were embodied in a map, which on examination by parties furnished with better means was found accurate. It was found by this party that the Rimouski presented difficulties which would forbid its ascent by a party provided with stores and instruments for the prosecution of a survey along the height of land, and that it would be impracticable even to make it the route of an expedition to reach its own source. The little knowledge which was possessed of its upper course and the fact that it had probably never been explored even by Indian hunters were accounted for by its difficulty of access, which would forbid the carriage of a sufficient supply of provisions for consumption during its ascent and descent. On other streams difficulties of this sort had been and were afterwards overcome by the use of the bateaux of the Penobscot, of greater burthen and strength than the birch canoes, but the continual repetition of portages on the Rimouski forbade the use of any vessel heavier than the latter.