finding the light insufficient to enable him to continue his search, he tied his horse to a tree, and laid down to await the return of daylight. At camp, guns were discharged, as large a fire kindled as we could find the means of making, and other measures taken to give notice of our situation; and late in the evening, the man whose mule had been the occasion of the accident, joined us, but was unable to give any account of Mr. Peale or the mule, which had, however, arrived before him. At seven o'clock on the morning following, Aug. 14th, Mr. P. returned to us, having convinced himself, by a careful examination of the river valley, that we were still above. He accordingly retraced his course, until he discovered the smoke of our encampment. He had been much harassed in the night by mosquitos; and bisons having recently occupied the shade of the tree under which he slept, the place afforded as little refreshment for the horse as for himself. Delaying a little to allow him time to make amends for his long absence, we left our camp at a later hour than usual; and moving along a wide and somewhat grassy plain, halted to dine near an old Indian breast-work by the side of a grove of cotton-wood trees, intermixed with a few small-leaved elms. This breast-work is built like that described on the Platte, a few days' march above the Pawnees. We have met with the remains of similar works in almost every grove of trees, about the base of the mountains; near some of them, we have noticed holes dug a few feet into the ground, probably as caches or depositories of provisions; the earth which was raised having been removed to a distance, or thrown into the river, that it might not lead to the discovery of the concealed articles. We have met with large excavations of this kind, having an entrance comparatively small, and so placed as to be {308} easily concealed; made by white hunters to hold their furs, and whatever else they might wish to deposit in safe keeping. The occurrence of the elm, the phytolacca, the cephalanthus, and other plants not to be met with in a desert of sand, give us the pleasing assurance of a change we have long been expecting to see in the aspect of the country. The blue jay, the purple martin, a deer, and some turkeys, were also seen near this encampment. The bed of the river is here eight hundred yards wide, but the quantity of water visible is much less than in some places above. The magnetic variation ascertained at this camp was 12° 30′ east. {309} CHAPTER VI {XIII} Sand Plains--Mississippi Hawk--Small-leaved Elm--Wild Horses--Hail-storm--Climate--Bisons--Grapes--Red Sand Formation--Gypsum.