circumstances over which he had no control.

Leaving the Dalles, Frémont followed up the Des Chutes River to its
headwaters in southeastern Oregon, thence he crossed over the divide
to the waters of the Klamath, which he followed southward to what is
known as Klamath Marsh. This he called "Klamath Lake."

Now started the hunt for Mary's Lake and the San Buenaventura River.
The party came down through southeastern Oregon into Nevada, where
they camped on the night of December 26, in Coleman Valley, on what
is called Twelve-Mile Creek, and about eleven miles from the present
California line. It may be noted here that at that time the parallel
between Nevada and California on the south and Oregon on the north,
was the southern boundary of the territory of the United States.
Frémont was, therefore, about to cross into Mexican territory.

He then progressed southward through what are now Washoe, Humboldt,
Churchill and Lyon counties, and over the California line into Mono
County, back again into Douglas, and thence over the mountains south
of Lake Tahoe, but did not find Mary's Lake, nor the places upon which
he relied to recruit his animals and give rest to his party. He did,
however, find Pyramid Lake. This being the body of water into which
the Truckee River flows, and the Truckee being the only outlet to Lake
Tahoe, it is well that this portion of the account be given in full.
Frémont and Carson were on ahead. The day was January 10, 1843.
Frémont writes:

Leaving a signal for the party to encamp, we continued our way
up the hollow, intending to see what lay beyond the mountain.
The hollow was several miles long, forming a good pass (some