We arrived the 18th of May upon the banks of the _Nebraska_, or _Big Horn_, which is called by the French by the less suitable name of the _Flat River_.[108] It is one of the most magnificent rivers of North America. From its source, which is hidden among the remotest mountains of this vast continent, to the river Missouri, of which it is a tributary, it receives a number of torrents descending from the [XXIX] Rocky Mountains; it refreshes and fertilizes immense vallies, and forms at its mouth the two great geographical divisions of the upper and lower Missouri. As we proceeded up this river, scenes more or less picturesque opened upon our view. In the middle of the Nebraska, thousands of islands, under various aspects, presented nearly every form of lovely scenery. I have seen some of those isles, which, at a distance, might be taken for flotillas, mingling their full sails with verdant garlands, or festoons of flowers; and as the current flowed rapidly around them, they seemed, as it were, flying on the waters, thus completing the charming illusion, by this apparent motion. The tree which the soil of these islands produces in the greatest abundance, is a species of white poplar, called cotton tree; the savages cut it in winter, and make of the bark, which appears to have a good taste, food for their horses.
Along the banks of the river, vast plains extend, where we saw, from time to time, innumerable herds of wild Antelopes. Further on, we met with a quantity of buffaloes' skulls and bones, regularly arranged in a semicircular form, and painted in different colors. It was a monument raised by superstition, for the Pawnees never undertake an expedition against the savages who may be hostile to their tribe, or against the wild beasts of the forest, without commencing the chase, or war, by some religious ceremony, performed amidst these heaps of bones. At the sight of them our huntsmen raised a cry of joy; they well knew that the plain of the buffaloes was not far off, and they expressed by these shouts the anticipated pleasure of spreading havoc among the peaceful herds.
Wishing to obtain a commanding view of the hunt, I got up early in the morning and quitted the camp alone, in order to ascend a hillock near our tents, from which I might [XXX] fully view the widely extended pasturages. After crossing some ravines, I reached an eminence, whence I descried a plain, whose radius was about twelve miles, entirely covered with wild oxen. You could not form, from any thing in your European markets, an idea of their movement and multitude. Just as I was beginning to view them, I heard shouts near me; it was our huntsmen, who rapidly rushed down upon the affrighted herd--the buffalos fell in great numbers beneath their weapons. When they were tired with killing them, each cut up his prey, put behind him his favorite part, and retired, leaving the rest for the voracity of the wolves, which are exceedingly numerous in these places, and they did not fail to enjoy the repast. On the following night I was awakened by a confused noise, which, in the fear of the moment, I mistook for impending danger. I imagined, in my first terror, that the Pawnees, conspiring to dispute with us the passage over their lands, had assembled around our camp, and that these lugubrious cries were their signal of attack.--"Where are we," said I, abruptly, to my guide. "Hark ye!--Rest easy," he replied, laying down again in his bed; "we have nothing to fear; it is the wolves that are howling with joy, after their long winter's hunger: they are making a great meal to-night on the carcasses of the buffalos, which our huntsmen have left after them on the plain."