the form of huge sharks' teeth. To the southward, for fifty miles at least, nothing but igneous rocks can be seen. Toward the Tetons there is a series of high ridges, passing off from the main Teton Range toward the northeast, and varying in height from 9,500 to 10,500 feet above the sea, and from 1,000 to 1,800 feet above the valleys at their base. The explorers ascended one of the high ridges, (not the highest, however,) and found it to be 1,650 feet above the valley at its foot. The northeast side is steep like a roof, the southwest breaking off abruptly. From the summit of this ridge, the view is grand in the extreme. To the westward the entire country, for the distance of fifty miles, seems to have been thrown up into high, sharp ridges, with gorges 1,000 to 1,500 feet in depth. Beautiful lakes, grassy meadows also, come within the field of vision. "I can conceive," says Dr. Hayden, "of no more wonderful and attractive region for the explorer. It would not be difficult for the traveller to make his way among these grand gorges, penetrating every valley, and ascending every mountain and ridge. The best of grass, wood, water and game are abundant to supply the wants of himself and animals. "I think," he continues, "that numerous passes could be found from the valley of Snake River to the basin of the Yellowstone. It seems to me there are many points on the south rim of the basin where a road could be made with ease into the valley of Snake River. From this ridge there appears to be but little difference in the altitude of Yellowstone Lake and Heart Lake, and they cannot be more than eight or ten miles apart, and yet the latter is one of the sources of Snake River. The little branches of Snake River nearly interlace with some streams that flow into the lake, and the gullies come up within two miles of the shore-line. There is a very narrow dividing ridge in one place, between the drainage, which may be within one mile of the lake." Heart Lake was visited by Colonel Barlow, who found it a pretty, pear-shaped sheet of water, four miles long and two wide in its broadest part. From the north it receives a warm creek fed by a considerable group of hot springs. Its outlet at the southern end joins the terminal creek of Snake River, a few miles from its source among the Yellowstone Mountains.