The Omaha tribe were greatly thinned by small-pox, and to this loathsome disease their great chieftain fell a victim. His dying request was bold and fanciful. Near the source of the Missouri is a high solitary rock, round which the river winds in a nearly circular direction, and which commands a view of the adjacent country for many miles around. There Blackbird had often sat to watch for the canoes of the white traders, and there it was his dying request to be buried. He was to be mounted upon his horse, completely armed, so as to overlook his lands, and watch for the coming boat of the white men. His orders were obeyed; and on that same high promontory, over the tomb of the Indian warrior was raised his national banner, capped with the scalps which he had taken in battle. Of course the Indians regard the rock with superstitious reverence, and have their own stories of the scenes which occasionally take place on and around it. A DESPERATE ADVENTURE. While encamped on the 24th of April, at a spring near the Spanish Trail, we were surprised by the sudden appearance amongst us of two Mexicans; a man and a boy. The name of the man was Andreas Fuentas, and that of the boy, a handsome lad of eleven years old, Pablo Hernandez. With a cavalcade of about thirty horses, they had come out from Puebla de los Angelos, near the Pacific; had lost half their animals, stolen by the Indians, and now sought my camp for aid. Carson and Godey, two of my men, volunteered to pursue them, with the Mexican; and, well mounted, the three set off on the trail. In the evening, Fuentas returned, his horse having failed; but Carson and Godey had continued the pursuit. [Illustration: KIT. CARSON.]