The animals struck into an easy canter, and a few minutes later all signs of civilization were left behind them.
The boys were in buoyant spirits.

There was just enough coolness in the air to make the exercise invigorating.

Here and there a few snowy flecks dotted the blue sky, but the sun shone with undimmed splendor, the warmth slightly increasing as the orb climbed the heavens.

To the northward the undulating plain was unbroken by hill or stream, so far as the eye could note, while to the eastward the prospect was similar, though they knew that the North Platte curved over in that direction, and, after winding around the upper end of the Laramie Mountains, joined the main stream far over in Nebraska.
To the westward the prospect was romantic and awe-inspiring.

The Wind River range towered far up in the sky in rugged grandeur, following a course almost parallel with their own, though gradually trending more to the left, in the direction of Yellowstone Park.