They had now approached the road at what is called the South Pass. The ascent had been so gradual, that, with all the intimate knowledge possessed by Carson, who had made this country his home for seventeen years, they were obliged to watch very closely to find the place at which they reached the culminating point. This was between two low hills, rising on either hand fifty or sixty feet. Approaching it from the mouth of the Sweet Water, a sandy plain, one hundred and twenty miles long, conducts, by a gradual and regular ascent, to the summit, about seven thousand feet above the sea; and the traveler, without being reminded of any change by toilsome ascents, suddenly finds himself on the waters which flow to the Pacific ocean. By the route they had traveled, the distance from Fort Laramie was three hundred and twenty miles, or nine hundred and fifty from the mouth of the Kansas. They continued on till they came to a tributary of the Green River, and then followed the stream up to a lake at its source in the mountains, and had here a view of extraordinary magnificence and grandeur, beyond what is seen in any part of the Alps, and here, beside the placid lake, they left the mules, intending to ascend the mountains on foot, and measure the altitude of the highest point. Fremont had wished to make a circuit of a few miles in the mountains, and visit the sources of the four great streams, the Colorado, the Columbia, the Missouri, and the Platte, but game was scarce, and his men were not accustomed to their entirely meat fare, and were discontented. With fifteen picked men, mounted on the best mules, was commenced the ascent of the mountains, and amid views of most romantic beauty, overlooking deep valleys with lakes nestled in them, surrounded by precipitous ridges, hundreds of feet high, they wound their way up to the summits of the ridges, to descend again, and plod along the valley of a little stream on the other side. For two days they continued upon their mules, through this magnificent region, when the peak appeared so near, it was decided to leave the mules beside a little lake, and proceed on foot; and as the day was warm, some of the party left their coats. But at night they had reached the limit of the piney region, when they were ten thousand feet above the waters of the Gulf of Mexico, and still the peak rose far above them, so that they camped without suffering, in a little green ravine, bordered with plants in bloom, and the next morning continued the ascent. Carson had led this day, and succeeded in reaching the summit of a snowy peak, supposed to be the highest, but saw from it the one they had been seeking, towering eight hundred or a thousand feet above him. They now descended off the snow, and sent back for mules, and food, and blankets, and by a blazing fire all slept soundly until morning.