This is, perhaps, one of the most grand and beautiful scenes of the kind to be met with in this country, owing to the perfect appearance of its several huge domes, turrets, and towers, which were everywhere as precise and as perfect in their forms as they are represented in the illustration. These stupendous works are produced by the continual washing down of the sides of these clay-formed hills; and although, in many instances, their sides, by exposure, have become so hardened, that their change is very slow; yet they are mostly subjected to continual phases, more or less, until ultimately their decomposition ceases, and their sides becoming seeded and covered with a green turf, which protects and holds them (and will hold them) unalterable: with carpets of green, and enamelled with flowers, to be gazed upon with admiration, by the hardy voyageur and the tourist, for ages and centuries to come. On Monday, the seventh day from the mouth of the Yellow Stone River, we floated away from this noble scene; looking back again and again upon it, wondering at its curious and endless changes, as the swift current of the river, hurried us by, and gradually out of sight of it. We took a sort of melancholy leave of it—but at every bend and turn in the stream, we were introduced to others—and others—and yet others, almost as strange and curious. At the base of one of these, although we had passed it, we with difficulty landed our canoe, and I ascended to its top, with some hours’ labour; having to cut a foot-hold in the clay with my hatchet for each step, a great part of the way up its sides. So curious was this solitary bluff, standing alone as it did, to the height of 250 feet (+plate+ 43), with its sides washed down into hundreds of variegated forms—with large blocks of indurated clay, remaining upon pedestals and columns as it were, and with such a variety of tints; that I looked upon it as a beautiful picture, and devoted an hour or two with my brush, in transferring it to my canvass. In the after part of this day we passed another extraordinary scene, which is denominated “the Three Domes” (+plate+ 44), forming an exceedingly pleasing group, though requiring no further description for the reader, who is now sufficiently acquainted with these scenes to understand them. [Illustration: 41] [Illustration: 42] [Illustration: 43] [Illustration: 44] On this day, just before night, we landed our little boat in front of the Mandan village; and amongst the hundreds and thousands who flocked towards the river to meet and to greet us, was Mr. Kipp, the agent of the American Fur Company, who has charge of their Establishment at this place. He kindly ordered my canoe to be taken care of, and my things to be carried to his quarters, which was at once done; and I am at this time reaping the benefits of his genuine politeness, and gathering the pleasures of his amusing and interesting society. LETTER—No. 11.