hrub, rendered
miry by occasional rain, and cut up by deep water-courses where they had
to dig roads for their wagons down the soft crumbling banks and to throw
bridges across the streams. The weather had attained the summer heat;
the thermometer standing about fifty-seven degrees in the morning,
early, but rising to about ninety degrees at noon. The incessant
breezes, however, which sweep these vast plains render the heats
endurable. Game was scanty, and they had to eke out their scanty fare
with wild roots and vegetables, such as the Indian potato, the wild
onion, and the prairie tomato, and they met with quantities of "red
root," from which the hunters make a very palatable beverage. The only
human being that crossed their path was a Kansas warrior, returning from
some solitary expedition of bravado or revenge, bearing a Pawnee scalp
as a trophy.

The country gradually rose as they proceeded westward, and their route
took them over high ridges, commanding wide and beautiful prospects.
The vast plain was studded on the west with innumerable hills of conical
shape, such as are seen north of the Arkansas River. These hills have
their summits apparently cut off about the same elevation, so as to
leave flat surfaces at top. It is conjectured by some that the whole
country may originally have been of the altitude of these tabular hills;
but through some process of nature may have sunk to its present level;
these insulated eminences being protected by broad foundations of solid
rock.

Captain Bonneville mentions another geological phenomenon north of
Red River, where the surface of the earth, in considerable tracts of
country, is covered with broad slabs of sandstone, having the form and
position of grave-stones, and looking as if they had been forced up by
some subterranean agitation. "The resemblance," says he, "which these
very remarkable spots have in many places to old church-yards is curious
in the extreme. One might almost fancy himself among the tombs of the
pre-Adamites."

On the 2d of June, they arrived on the main stream of the Nebraska or
Platte River; twenty-five miles below the head of the Great Island. The
low banks of this river give it an appearance of great width. Captain
Bonneville measured it in one place, and found it twenty-two hundred
yards from bank to bank. Its depth was from three to six feet, the
bottom full of quicksands. The Nebraska is studded with islands covered
with that species of popla