In addition to the knowledge of human nature and of my art, which I hope to acquire by this toilsome and expensive undertaking, I have another in view, which, if it should not be of equal service to me, will be of no less interest and value to posterity. I have, for many years past, contemplated the noble races of red men who are now spread over these trackless forests and boundless prairies, melting away at the approach of civilization. Their rights invaded, their morals corrupted, their lands wrested from them, their customs changed, and therefore lost to the world; and they at last sunk into the earth, and the ploughshare turning the sod over their graves, and I have flown to their rescue—not of their lives or of their race (for they are “_doomed_” and must perish), but to the rescue of their looks and their modes, at which the acquisitive world may hurl their poison and every besom of destruction, and trample them down and crush them to death; yet, phœnix-like, they may rise from the “stain on a painter’s palette,” and live again upon canvass, and stand forth for centuries yet to come, the living monuments of a noble race. For this purpose, I have designed to visit every tribe of Indians on the Continent, if my life should be spared; for the purpose of procuring portraits of distinguished Indians, of both sexes in each tribe, painted in their native costume; accompanied with pictures of their villages, domestic habits, games, mysteries, religious ceremonies, &c. with anecdotes, traditions, and history of their respective nations. If I should live to accomplish my design, the result of my labours will doubtless be interesting to future ages; who will have little else left from which to judge of the original inhabitants of this simple race of beings, who require but a few years more of the march of civilization and death, to deprive them of all their native customs and character. I have been kindly supplied by the Commander-in-Chief of the Army and the Secretary of War, with letters to the commander of every military post, and every Indian agent on the Western Frontier, with instructions to render me all the facilities in their power, which will be of great service to me in so arduous an undertaking. The opportunity afforded me by familiarity with so many tribes of human beings in the simplicity of nature, devoid of the deformities of art; of drawing fair conclusions in the interesting sciences of physiognomy and phrenology; of manners and customs, rites, ceremonies, &c.; and the opportunity of examining the geology and mineralogy of this western, and yet unexplored country, will enable me occasionally to entertain you with much new and interesting information, which I shall take equal pleasure in communicating by an occasional Letter in my clumsy way. LETTER—No. 3. MOUTH OF YELLOW STONE, _UPPER MISSOURI_.