R. CATLIN met with many interesting adventures, while visiting the numerous and savage tribes of the great west, for the purpose of seeing and judging for himself, of their habits and modes of life. One of these he details in his valuable work, as “The Story of the Dog,” and as it is a fine illustration of the dangers encountered by adventurers among the Indians, and of the certainty of revenge which follows an injury, we here insert it: I had passed up the Missouri river, on the steamboat Yellow Stone, on which I ascended the Missouri to the mouth of Yellow Stone river. While going up, this boat, having on board the United States Indian agent, Major Sanford--Messrs. Pierre, Chouteau, McKenzie of the American Fur Company, and myself, as passengers, stopped at this trading-post, and remained several weeks; where were assembled six hundred families of Sioux Indians, their tents being pitched in close order on an extensive prairie on the bank of the river. This trading-post, in charge of Mr. Laidlaw, is the concentrating place, and principal depot, for this powerful tribe, who number, when all taken together, something like forty or fifty thousand. On this occasion, five or six thousand had assembled to see the steamboat, and meet the Indian agent, which, and whom they knew were to arrive about this time. During the few weeks that we remained there, I was busily engaged painting my portraits, for here were assembled the principal chiefs and medicine-men of the nation. To these people, the operations of my brush were entirely new and unaccountable, and excited amongst them the greatest curiosity imaginable. Every thing else, even the steamboat, was abandoned for the pleasure of crowding into my painting-room, and witnessing the result of each fellow’s success, as he came out from under the operation of my brush. They had been at first much afraid of the consequences that might flow from so strange and unaccountable an operation; but having been made to understand my views, they began to look upon it as a great honor, and afforded me the opportunities that I desired; exhibiting the utmost degree of vanity for their appearance, both as to features and dress. The consequence was, that my room was filled with the chiefs who sat around, arranged according to the rank or grade which they held in the estimation of their tribe; and in this order it became necessary for me to paint them, to the exclusion of those who never signalized themselves, and were without any distinguishing character in society.