REPORT BY GEORGE M. DAWSON. 33

slope of volcanic materials. At the western end of the range, nearest to
the point of view, the basalt flows simulate terraces, in their flat tops
and broken and abrupt fronts. One of the mules died this evening from
accidental injuries received during the day’s march. ,

July 14.—Travelled almost directly southward, descending for about a aipine
mile and a-half, when a stream forty feet wide and six inches deep, flowing er
rapidly westward to the Tahyesco, is crossed. From this a gradual ascent
is again made, and the trail then passes southward for some miles through
a remarkably straight notch-like valley, separated by low hills from the
Tahyesco on the west. A narrow grassy meadow follows the valley, and
slopes northward and southward from its highest portion, the whole surface
being saturated with moisture and indented with little hollows filled with
clear water. The grasses and carices are at this date green and well
grown, and very nutritious pasture could, no doubt, be obtained here during
the summer months. After crossing two other streams—the first ten feet
wide by- six inches deep, with rapid current; the second, fifteen feet six
inches, with slope of one in ten, reached the Tahyesco—and camped on its
bank among burnt woods, at an elevation of about 3,690 feet, having made
eleven miles in the day’s march. The depth of the snow in the woods of Depth of snow
this high region in winter must be very great, judging from the height at a
which branches have been broken down by it, and of the stumps of
trees which have been cut at that season by the Indians. The line above
which large patches of snow are seen during the summer months on
this Tsi-tsutl Range is much lower than that on the Il-ga-chuz Range, to
the east, of which the climatic circumstances must otherwise be much the
same. A drenching thunderstorm this afternoon and steady rain in the
evening.

July 15—After crossing a branch of the Tahyesco twenty feet wide by wpper part of
one foot deep, with rapid current, we travelled eastward near the main.
stream, which was estimated at thirty feet wide by one deep, ascending
‘gradually into a quite alpine region over 4,000 feet above the sea level,

and beyond the limit of thick forest growth. The valley of the branch
of the Tahyesco here followed is sometimes a mile in width, and runs
southward between two ranges of hills; that on the west being the
higher, and showing through its gaps more elevated peaks of the Coast
Range. About two miles from camp, the main stream of the Tahyesco
enters the valley up which the trail passes, from the right, forming a fine
waterfall. The trees, which still continue to grow in clumps where
“heavy drifts of hard snow encumber much of the surface, belong to three
species :—Pinus contorta, Pinus albicaulis, and Abies lasiocarpa—all
D