se took them through a bold and stern country, bordered by a
range of low mountains, running east and west. Everything around bore
traces of some fearful convulsion of nature in times long past. Hitherto
the various strata of rock had exhibited a gentle elevation toward the
southwest, but here everything appeared to have been subverted, and
thrown out of place. In many places there were heavy beds of white
sandstone resting upon red. Immense strata of rocks jutted up into crags
and cliffs; and sometimes formed perpendicular walls and overhanging
precipices. An air of sterility prevailed over these savage wastes. The
valleys were destitute of herbage, and scantily clothed with a stunted
species of wormwood, generally known among traders and trappers by the
name of sage. From an elevated point of their march through this region,
the travellers caught a beautiful view of the Powder River Mountains
away to the north, stretching along the very verge of the horizon, and
seeming, from the snow with which they were mantled, to be a chain of
small white clouds, connecting sky and earth.

Though the thermometer at mid-day ranged from eighty to ninety, and even
sometimes rose to ninety-three degrees, yet occasional spots of snow
were to be seen on the tops of the low mountains, among which the
travellers were journeying; proofs of the great elevation of the whole
region.

The Nebraska, in its passage through the Black Hills, is confined to
a much narrower channel than that through which it flows in the plains
below; but it is deeper and clearer, and rushes with a stronger current.
The scenery, also, is more varied and beautiful. Sometimes it glides
rapidly but smoothly through a picturesque valley, between wooded banks;
then, forcing its way into the bosom of rugged mountains, it rushes
impetuously through narrow defiles, roaring and foaming down rocks and
rapids, until it is again soothed to rest in some peaceful valley.

On the 12th of July, Captain Bonneville abandoned the main stream of the
Nebraska, which was continually shouldered by rugged promontories, and
making a bend to the southwest, for a couple of days, part of the time
over plains of loose sand, encamped on the 14th on the banks of the
Sweet Water, a stream about twenty yards in breadth, and four or five
feet deep, flowing between low banks over a sandy soil, and forming one
of the forks or upper branches of the Nebraska. Up this stream they now
shaped their cours