A day or two after the death of the big bear, we went out one afternoon on horseback, intending merely to ride down to see a great canyon lying some six miles west of our camp; indeed, we went more to look at the scenery than for any other reason, though, of course, neither of us ever stirred out of camp without his rifle. We rode down the valley in which we had camped, through alternate pine groves and open glades, until we reached the canyon, and then skirted its brink for a mile or so. It was a great chasm, many miles in length, as if the table-land had been rent asunder by some terrible and unknown force; its sides were sheer walls of rock, rising three or four hundred feet straight up in the air, and worn by the weather till they looked like the towers and battlements of some vast fortress. Between them at the bottom was a space, in some places nearly a quarter of a mile wide, in others very narrow, through whose middle foamed a deep, rapid torrent of which the sources lay far back among the snow-topped mountains around Cloud Peak. In this valley, dark-green, sombre pines stood in groups, stiff and erect; and here and there among them were groves of poplar and cottonwood, with slender branches and trembling leaves, their bright green already changing to yellow in the sharp fall weather. We went down to where the mouth of the canyon opened out, and rode our horses to the end of a great jutting promontory of rock, thrust out into the plain; and in the cold, clear air we looked far over the broad valley of the Bighorn as it lay at our very feet, walled in on the other side by the distant chain of the Rocky Mountains.