landmark among the mountains, called Independence Rock. It is an isolated elevation, composed of masses of rock, about one hundred feet in height, and a mile in circumference, standing near the northern bend of the Sweetwater River, and between the ranges of mountains which border the valley of that stream. The trail proceeds up the Sweetwater River, and passes a remarkable fissure in the Rocky Mountain wall, which is called the Devil's Gate. The fissure is about thirty feet in breadth, and the perpendicular walls on each side of the channel of the stream which flows through it, are nearly three hundred feet high. The trail leaves the river about twelve miles from where it first strikes it, and then returns to it after traversing about sixteen miles. It again diverges from the river and crosses a broken and arid plain, which presents but few signs of vegetation. Passing through a gap between two ranges of granite mountains, the first view of the Wind River Mountains is obtained. The trail then proceeds through a narrow valley several miles in length, the surface of which is white with an alkaline efflorescence, and then returns to the Sweetwater River. Continuing up the valley of the Sweetwater, occasionally leaving the bank of the stream and passing over the rolling and barren tablelands, it crosses two small creeks which present good places for encampment. Several miles farther on, the trail crosses the Sweetwater River, and then leaves it finally, making a gradual ascent to the South Pass of the Rocky Mountains, or the dividing ridge which separate the waters of the Atlantic and Pacific. After the summit of the ridge is reached, the trail passes two or three miles over a level surface, and then descends to the spring, well known to emigrants as the "Pacific Spring." The water from this spring is emptied into the Colorado River of the West, which river empties into the Gulf of California. This Pacific Spring is two miles west of the South Pass, and nine hundred and eighty-three miles from Independence, Missouri.