It is with the hunters we will briskly canter toward the bold but smooth and grassy bluffs that bound the broad valley, for we are not yet in sight of the grander, but less beautiful, scenery (of the Chimney Rock, Court House, and other bluffs so nearly resembling giant castles and palaces) made by the passage of the Platte through the Highlands near Laramie. We have been traveling briskly for more than an hour. We have reached the top of the bluff, and now have turned to view the wonderful panorama spread before us. To those who have not been on the Platte, my powers of description are wholly inadequate to convey an idea of the vast extent and grandeur of the picture, and the rare beauty and distinctness of its detail. No haze or fog obscures objects in the pure and transparent atmosphere of this lofty region. To those accustomed to only the murky air of the sea-board, no correct judgment of distance can be formed by sight, and objects which they think they can reach in a two hours' walk, may be a day's travel away; and though the evening air is a better conductor of sound, on the high plain during the day the report of the loudest rifle sounds little louder than the bursting of a cap; and while the report can be heard but a few hundred yards, the smoke of the discharge may be seen for miles. So extended is the view from the bluff on which the hunters stand, that the broad river, glowing under the morning sun like a sheet of silver, and the broader emerald valley that borders it, stretch away in the distance until they narrow at almost two points in the horizon, and when first seen, the vast pile of the Wind River mountains, though hundreds of miles away, looks clear and distinct as a white cottage on the plain. We are full six miles away from the line of march; though everything is dwarfed by distance, it is seen distinctly. The caravan has been about two hours in motion, and is now extended as widely as a prudent regard for safety will permit. First, near the bank of the shining river, is a company of horsemen; they seem to have found an obstruction, for the main body has halted, while three or four ride rapidly along the bank of a creek or slough. They are hunting a favorable crossing for the wagons; while we look they have succeeded; it has apparently required no work to make it possible, while all but one of the party have passed on, and he has raised a flag, no doubt a signal to the wagons to steer their course to where he stands.