THE BIG-HORNED OR MOUNTAIN RAM.

"July 18.—This morning we saw a large herd of the big-horned animals, who were bounding among the rocks in the opposite cliff with great agility. These inaccessible spots secure them from all their enemies; and the only danger they encounter is in wandering among these precipices, where we should suppose it scarcely possible for any animal to stand. A single false step would precipitate them at least five hundred feet into the river.

"The game continues abundant. We killed to-day the largest male elk we have yet seen. On placing it in its natural, erect position, we found that it measured five feet three inches from the point of the hoof to the top of the shoulder.

"The antelopes are yet lean. This fleet and quick-sighted animal is generally the victim of its curiosity. When they first see the hunters, they run with great velocity. If the hunter lies down on the ground, and lifts up his arm, his hat, or his foot, the antelope returns on a light trot to look at the object, and sometimes goes and returns two or three times, till at last he approaches within reach of the rifle. So, too, they sometimes leave their flock to go and look at the wolves, who crouch down, and, if the antelope be frightened at first, repeat the same manœuvre, and sometimes relieve each other, till they decoy the antelope from his party near enough to seize it."

THE GATES OF THE ROCKY MOUNTAINS.

"July 20.—During the day, in the confined valley through which we are passing, the heat is almost insupportable; yet, whenever we obtain a glimpse of the lofty tops of the mountains, we are tantalized with a view of the snow. A mile and a half farther on, the rocks approach the river on both sides, forming a most sublime and extraordinary spectacle. For six miles, these rocks rise perpendicularly from the water's edge to the height of nearly twelve hundred feet. They are composed of a black granite near the base; but judging from its lighter color above, and from fragments that have fallen from it, we suppose the upper part to be flint, of a yellowish-brown and cream color. Nothing can be imagined more tremendous than the frowning darkness of these rocks, which project over the river, and menace us with destruction. The river, one hundred and fifty yards in width, seems to have forced its channel down this solid mass: but so reluctantly has it given way, that, during the whole distance, the water is very deep even at the edges; and, for the first three miles, there is not a spot, except one of a few yards in extent, on which a man could stand between the water and the towering perpendicular of the mountain. The convulsion of the passage must have been terrible; since, at its outlet, there are vast columns of rock torn from the mountain, which are strewed on both sides of the river, the trophies, as it were, of victory. We were obliged to go on some time after dark, not being able to find a spot large enough to encamp on. This extraordinary range of rocks we called the Gates of the Rocky Mountains."

NATURAL PRODUCTIONS.

"July 29.—This morning the hunters brought in some fat deer of the long-tailed red kind, which are the only kind we have found at this place. There are numbers of the sandhill-cranes feeding in the meadows. We caught a young one, which, though it had nearly attained its full growth, could not fly. It is very fierce, and strikes a severe blow with its beak. The kingfisher has become quite common this side of the falls; but we have seen none of the summer duck since leaving that place. Small birds are also abundant in the plains. Here, too, are great quantities of grasshoppers, or crickets; and, among other animals, large ants, with a reddish-brown body and legs, and a black head, which build little cones of gravel ten or twelve inches high, without a mixture of sticks, and with but little earth. In the river we see a great abundance of fish, but cannot tempt them to bite by any thing on our hooks."

THE FORKS OF THE MISSOURI.

"July 28, 1805.—From the height of a limestone cliff, Capt. Lewis observed the three forks of the Missouri, of which this river is one. The middle and south-west forks unite at half a mile above the entrance of the south-east fork. The country watered by these rivers, as far as the eye could command, was a beautiful combination of meadow and elevated plain, covered with a rich grass, and possessing more timber than is usual on the Missouri. A range of high mountains, partially covered with snow, is seen at a considerable distance, running from south to west.