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The buffalo were somewhat startled at the report of the firearms; but the hunters succeeded in killing a couple of fine cows, and, having secured the best of the meat, continued forward until some time after dark, when, encamping in a large thicket of willows, they made a great fire, roasted buffalo beef enough for half a score, disposed of the whole of it with keen relish and high glee, and then "turned in" for the night and slept soundly, like weary and well-fed hunters.

At daylight they were in the saddle again, and skirted along the river, passing through fresh grassy meadows, and a succession of beautiful groves of willows and cotton-wood. Toward evening, Captain Bonneville observed smoke at a distance rising from among hills, directly in the route he was pursuing. Apprehensive of some hostile band, he concealed the horses in a thicket, and, accompanied by one of his men, crawled cautiously up a height, from which he could overlook the scene of danger. Here, with a spy-glass, he reconnoitred the surrounding country, but not a lodge nor fire, not a man, horse, nor dog, was to be discovered; in short, the smoke which had caused such alarm proved to be the vapor from several warm, or rather hot springs of considerable magnitude, pouring forth streams in every direction over a bottom of white clay. One of the springs was about twenty-five yards in diameter, and so deep that the water was of a bright green color.

They were now advancing diagonally upon the chain of Wind River Mountains, which lay between them and Green River valley. To coast round their southern points would be a wide circuit; whereas, could they force their way through them, they might proceed in a straight line. The mountains were lofty, with snowy peaks and cragged sides; it was hoped, however, that some practicable defile might be found. They attempted, accordingly, to penetrate the mountains by following of the branches of the Popo Agie, but soon found themselves in the midst of stupendous crags and precipices, that barred all progress. Retracing their steps, and falling back upon the river, they consulted where to make another attempt. They were too close beneath the mountains to scan them generally, but they now recollected having noticed, from the plain, a beautiful slope, rising at an angle of about thirty degrees, and apparently without any break, until it reached the snowy region. Seeking this gentle acclivity, they began to ascend it with alacrity, trusting to find at the top one of those elevated plains which prevail among the Rocky Mountains. The slope