We left our encampment at half-past five in the morning, and followed the river; the aggregate of our courses for the day was about east, and the distance twenty-one miles. Our last course led us out of the river valley, and for a few miles lay across the open plain. Here we passed a large and uncommonly beautiful village of the prairie marmots, covering an area of about a mile square, having a smooth surface, and sloping almost imperceptibly towards the east. The grass which covers this plain is fine, thick, and close fed. As we approached the village, it happened to be covered with a herd of some thousands of bisons; on the left were a number of wild horses, and immediately before us twenty or thirty antelopes, and about half as many deer. As it was near sunset the light fell obliquely upon the grass, giving an additional brilliancy to its dark verdure. {11} The little inhabitants of the village were seen running playfully about in all directions, and as we approached they perched themselves on their burrows, and proclaimed their terror in the customary note of alarm. A scene of this kind comprises most of what is beautiful and interesting to the passing traveller in the wide unvaried plains of the Missouri and Arkansa. In the course of the day we passed two large creeks, one entering from the south, the other from the north; also several springs on the south side at the base of a rocky hill, rising abruptly from the bed of the river; but notwithstanding all these tributary supplies, no running water appeared above the sands of the river bed. We passed great numbers of carcasses of bisons recently slaughtered, and the air was darkened by flights of carrion birds, among which we distinguished the obscene vulture aura, and the vulture atrata, the black vulture of the Southern States. From the great number of carcasses and skeletons, we were induced to believe ourselves on the hunting ground of some nation of Indians, and our expectations of seeing the Pawnees of Red river began to revive. Our hunters killed two fine bucks, both in uncommonly good condition for the season. The fat on the ribs of either of them was more than an inch thick. They were both changing their hair to what is called the _blue_, which at this season is a sure indication that the animal is in good condition.