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Rh might be descried by some scouts and spies of that race of Ishmaelites, whose predatory life required them to be constantly on the alert. On seeing the trace turn so much to the north, thereforth, they abandoned it, and kept on their course to the northeast for eighteen miles, through a beautifully undulating country, having the main chain of mountains on the left, and a considerably elevated ridge on the right. Here the mountain ridge which divides Wind River from the head waters of the Columbia and Spanish Rivers ends abruptly, and winding to the north of east, becomes the dividing barrier between a branch of the Big Horn and Cheyenne Rivers, and those head waters which flow into the Missouri below the Sioux country.

The ridge which lay on the right of the travellers having now become very low, they passed over it, and came into a level plain about ten miles in circumference, and incrusted to the depth of a foot or eighteen inches with salt as white as snow. This is furnished by numerous salt springs of limpid water, which are continually welling up, overflowing their borders and forming beautiful crystallizations. The Indian tribes of the interior are excessively fond of this salt, and repair to the valley to collect it, but it is held in distaste by the tribes of the sea-coast, who will eat nothing that has been cured or seasoned by it.

This evening they encamped on the banks of a small stream, in the open prairie. The northeast wind was keen and cutting; they had nothing wherewith to make a tire, but a scanty growth of sage, or wormwood, and were fain to wrap themselves up in their blankets, and huddle themselves in their "nests," at an early hour. In the course of the evening, Mr. M'Lellan, who had now regained his strength, killed a buffalo, but it was some distance from the camp, and they postponed supplying themselves from the carcass until the following morning.

The next day (October 21st) the cold continued, accompanied by snow. They set forward on their bleak and toilsome way, keeping to the east-northeast, toward the lofty summit of a mountain, which it was necessary for them to cross. Before they reached its base they passed another large trail, steering a little to the right of the point of the mountain. This they presumed to have been made by another band of Crows, who had probably been hunting lower down on the Spanish River.

The severity of the weather compelled them to encamp at the end of fifteen miles, on the skirts of the mountain, where