At the head of this valley is the second cañon of the Yellowstone, granite walls rising on either side to the height of a thousand feet or more, and the river dashing through the narrow gorge with great velocity. Seen from the lofty mountain spur over which the trail is forced to pass, the bright green color of the water, and the numerous ripples, capped with white foam, as the roaring torrent rushes around and over the multitude of rocks that have fallen from above into the channel, present a most picturesque appearance. Above the cañon, which is about a mile in length, the valley widens slightly, then narrows so as to compel the traveller to cross a ridge, on whose summit lies a beautiful lake. Descending to the valley again the road traverses a tract of level bottom land, a mile or two wide, covered with a heavy growth of sage-brush. Throughout all this portion of its course, the Yellowstone is abundantly stocked with trout of the largest variety known this side the Rocky Mountains. Some ten miles above the second cañon on the edge of the river valley is Cinnabar Mountain, whose weather-beaten side presents one of the most singular freaks of nature in the world. Two parallel vertical walls of rock, fifty feet wide, traverse the mountain from base to summit, and project to the height of three hundred feet for a distance of fifteen hundred feet. The sides are as even as if wrought by line and plumb. The rock between the walls and on either side has been completely worn away. Speaking of this curious formation, Mr. Langford says: "We had seen many of the capricious works wrought by erosion upon the friable rocks of Montana, but never before upon so majestic a scale. Here an entire mountain-side, by wind and water, had been removed, leaving as the evidences of their protracted toil these vertical projections, which, but for their immensity, might as readily be mistaken for works of art as of nature. Their smooth sides, uniform width and height, and great length, considered in connection with the causes which had wrought their insulation, excited our wonder and admiration. They were all the more curious because of their dissimilarity to any other striking objects in natural scenery that we had ever seen or heard of. In future years, when the wonders of the Yellowstone are incorporated into the family of fashionable resorts, there will be few of its attractions surpassing in interest this marvellous freak of the elements."