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      In the early sixties a trail led from the broad Missouri, swirling yellow and turgid between its green-groved borders, for miles and miles out upon the grassy Nebraska plains, turning westward over the undulating prairie, with its swales and billows and long, winding lines of cottonwoods, to a slow, vast heave of rising ground—Wyoming—where the herds of buffalo grazed and the wolf was lord and the camp-fire of the trapper sent up its curling blue smoke from beside some lonely stream; on and on over the barren lands of eternal monotony, all so gray and wide and solemn and silent under the endless sky; on, ever on, up to the bleak, black hills and into the waterless gullies and through the rocky gorges where the deer browsed and the savage lurked; then slowly rising to the pass between the great bold peaks, and across the windy uplands into Utah, with its verdant valleys, green as emeralds, and its haze-filled cañons and wonderful wind-worn cliffs and walls, and its pale salt lakes, veiled in the shadows of stark and lofty rocks, dim, lilac-colored, austere, and isolated; ever onward across Nevada, and ever westward, up from desert to mountain, up into California, where the white streams rushed and roared and the stately pines towered, and seen from craggy heights, deep down, the little blue lakes gleamed like gems; finally sloping to the great descent, where the mountain world ceased and where, out beyond the golden land, asleep and peaceful, stretched the illimitable Pacific, vague and grand beneath the setting sun.

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      Deep in the Wyoming hills lay a valley watered by a stream that ran down from Cheyenne Pass; a band of Sioux Indians had an encampment there. Viewed from the summit of a grassy ridge, the scene was colorful and idle and quiet, in keeping with the lonely, beautiful valley. Cottonwoods and willows showed a bright green; the course of the stream was marked in dark where the water ran, and light where the sand had bleached; brown and black dots scattered over the valley were in reality grazing horses; lodge-pole tents gleamed white in the sun, and tiny bits of red stood out against the white; lazy wreaths of blue smoke rose upward.

      The Wyoming hills were split by many such valleys and many such bare, grassy ridges sloped up toward the mountains. Upon the side of one ridge, the highest, there stood a solitary mustang, haltered with a lasso. He was a ragged, shaggy, wild beast, and there was no saddle or bridle on him, nothing but the halter. He was not grazing, although the bleached white grass grew long and thick under his hoofs. He looked up the slope, in a direction indicated by his pointing ears, and watched a wavering movement of the long grass.

      It was wild up on that ridge, bare of