Mr. Langford's account of this expedition, published in the second volume of _Scribner's Monthly_, and the report of Lieutenant Doane, printed some time after by the United States Government, (Ex. Doc. No. 51, 41st Congress,) gave to the world the first authentic information of the marvels of this wonderful region. Though their route lay through a terrible wilderness, and most of the party were but amateur explorers at best, only one (Mr. Everts) met with a serious mishap. This gentleman's story of his separation from the company, and his thirty-seven days of suffering and perilous wandering, is one of the most thrilling chapters of adventure ever written. The path fairly broken, and the romance of the Yellowstone shown to have a substantial basis in reality, it was not long before others were ready to explore more fully the magnificent scenery and the strange and peculiar phenomena described by the adventurers of 1870. As soon as the following season was sufficiently advanced to admit of explorations among the mountains, the Chief Engineer of the Military Department of the Missouri, Brevet Colonel John W. Barlow, set out for a two months' survey of the Yellowstone Basin, under special orders from General Sheridan. His route lay along the river to the lake; thence along the northern shore of the lake to the hot springs on its western bank; thence across the mountains westward to the Geyser Basins of Firehole River, which he ascended to its source in Madison Lake; thence to Heart Lake, the source of Snake River; thence across the mountains to Bridger's Lake, in the valley of the Upper Yellowstone. Descending this stream to where it enters Yellowstone Lake, he returned by the east shore of the lake to Pelican Creek; thence across the country to the Falls of the Yellowstone; thence over the mountains to the East Fork of the Yellowstone, which he followed to its junction with the main stream. In the meantime, a large and thoroughly-organized scientific party, under Dr. F. V. Hayden, U. S. geologist, were making a systematic survey of the region traversed by Colonel Barlow. The work done by this party is briefly summarized by Dr. Hayden as follows: