17.2" N."

In order to make assurance doubly sure, Captain Lewis resolved to
take four men with him and ascend the south branch (that is, the true
Missouri), before committing the expedition to that route as the final
one. His proposition was that his party should proceed up the river as
rapidly as possible in advance of the main party. On the second day out,
says the journal:--

"Captain Lewis left the bank of the river in order to avoid the steep
ravines, which generally run from the shore to the distance of one or
two miles in the plain. Having reached the open country he went for
twelve miles in a course a little to the W. of S.W.; when, the sun
becoming warm by nine o'clock, he returned to the river in quest of
water, and to kill something for breakfast; there being no water in
the plain, and the buffalo, discovering them before they came within
gunshot, took to flight. They reached the banks in a handsome open low
ground with cottonwood, after three miles' walk. Here they saw two large
brown bears, and killed them both at the first fire--a circumstance
which has never before occurred since we have seen that animal. Having
made a meal of a part, and hung the remainder on a tree, with a note for
Captain Clark, they again ascended the bluffs into the open plains.
Here they saw great numbers of the burrowing-squirrel, also some wolves,
antelopes, mule-deer, and vast herds of buffalo. They soon crossed a
ridge considerably higher than the surrounding plains, and from its top
had a beautiful view of the Rocky Mountains, which are now completely
covered with snow. Their general course is from S.E. to N. of N.W., and
they seem to consist of several ranges which successively rise above
each other, till the most distant mingles with the clouds. After
travelling twelve miles they again met the river, where there was a
handsome plain of cottonwood."

Again leaving the river, Captain Lewis bore off more to the north, the
stream here bearing considerably to the south, with difficult bluffs
along its course. But fearful of passing the Great Falls before reaching
the Rocky Mountains, he again changed his course and, leaving the bluffs
to his right he turned towards the river.

The journal gives this description of what followed:--

"In this direction Captain Lewis had gone about two miles, when his
ears were saluted with the agreeable sound of a fall of water, and as he
advanced a spray, which seemed driven by the high sout