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. "To the south-east fork the name of Gallatin was assigned, in honor of the Secretary of the Treasury. On examining the other two streams, it was difficult to decide which was the larger or real Missouri: they are each ninety yards wide, and similar in character and appearance. We were therefore induced to discontinue the name of Missouri, and to give to the south-west branch the name of Jefferson, in honor of the President of the United States and the projector of the enterprise; and called the middle branch Madison, after James Madison, Secretary of State. "July 30.--We reloaded our canoes, and began to ascend Jefferson River. The river soon became very crooked; the current, too, is rapid, impeded with shoals, which consist of coarse gravel. The islands are numerous. On the 7th of August, we had, with much fatigue, ascended the river sixty miles, when we reached the junction of a stream from the north-west, which we named Wisdom River. We continued, however, to ascend the south-east branch, which we were satisfied was the true continuation of the Jefferson." THE SHOSHONEES, OR SNAKE INDIANS.