search for water, this being our third day without it, we turned
the southwest point of San Francisco mountain, and, avoiding the
valley on the left, kept up on the spurs close at its foot.
After travelling about seven miles, we reached a permanent
spring that poured from a hillside and was lost in the grassy
plain below. In honor of the guide it was called Leroux’s
spring. It is the same to which he conducted Captain Sitgreaves
two years since, but by a different route, passing around the
north and the western base of the mountain.
December 29—camp 91.--...
This morning, the summit of San Francisco being visible, the
triangulation commenced yesterday was completed. The height
above Leroux’s Spring was found to be 4,673 feet, making it
about 12,000 feet above the level of the sea. At noon, the
temperature of the spring, where it issues from the hill-side,
was measured. The immersed thermometer read 48.8 degrees; 3.2
degrees higher than the surrounding atmosphere. That is probably
the mean temperature of the place. The water pours, in several
streams, down the ravine, producing a fringe of green herbage.