After a navigation of two months, and a progress of more than a thousand miles from their winter camp, the party became considerably embarrassed, at the conflux of two rivers, which were, apparently, of equal magnitude. It was important for them to decide which of the streams in question was the true Missouri; because the river, which it was their object to ascend, was described to be at no great distance from the head waters, running, from the opposite side of the Rocky Mountains, towards the Pacific ocean. Two canoes, with three men, were consequently dispatched, to survey each of these doubtful streams; and parties were sent out by land, to discover, if possible, from the rising grounds, the distant bearings of the lofty ranges of mountains, which were conspicuous in the west; and some of which, though it was now the month of June, were covered with snow. Hence, there was no doubt of their vicinity to the great central ridge of American mountains; but the direction of the rivers just mentioned, could not be distinguished to any considerable distance. Of the two, the one coming from the north, had the brown colour and thick appearance of the Missouri; while the southern river had a rapid current, a pebbly bed, and transparent water, as if it issued from a mountainous country. The resemblance of the former to the river already navigated, led nearly all the privates of the party to consider it as the Missouri; but the clearness of the other stream induced the two captains to the conclusion that it proceeded from those central mountains, which were the grand objects of their search. After a further investigation, they resolved to pursue the course of the latter. It was, however, requisite to make a deposit of all the heavy baggage, that could possibly be spared, as the increasing shallowness of the water would soon render the navigation much more laborious than it had hitherto been. They accordingly adopted a plan, common among traders who bring merchandise into the country of Indians of doubtful integrity, that of digging a hole in the ground, small at the top, but widened in the descent, somewhat like the shape of a kettle. Choice was made of a dry situation; and the sod, being carefully removed, the excavation was completed, a flooring of wood and hides was laid at the bottom, and the goods were covered with skins: the earth was then thrown into the river, and the sod laid on again with so much care, that not the slightest appearance remained of the surface having been disturbed.