Southern Tibet : vol.4 / 306 ページ（カラー画像）

0306	Southern Tibet : vol.4
南チベット : vol.4

a profile may be sketched of this section, showing how extremely flat the range is
at the line where we crossed it.

All night and all day the storm continued with the greatest fury, and the
temperature had only been at —14.1°. From the camp we had, in the morning, an
excellent opportunity to study the action of the wind over the extensive plain and
the mountains to the north. Especially to the N. E., large compact clouds of red
dust were swept from the ground and sailed up the slopes of the mountains around
mount Keva, which now and again disappeared. These red clouds seemed to rise
to a considerable altitude above the highest crests of the mountains and then to
disappear beyond them continuing their journey, God knows how far. At other
places where the northern mountains were yellow, the clouds of dust had a yellowish
tint. From the ground of the plain small clouds of grey dust were ploughed and
whirled up by the tremendous force of the wind, but seemed to rise less high than
the red and yellow clouds. As the strongest and most constant winds in high Tibet
come from the S. W. and W. S. W., the sides of the mountains directly exposed
to the wind, are more carved out by corrasion, and all the fine material existing is
swept away. On the lee sides, the action of the prevailing wind is less energetic.
This fact plays a certain part in the weathering as I have tried to explain in my
Scientific Results.

On the left bank of the watercourse of Camp XCI, a mani-rigmo was standing.
Leaving it we marched east and E. S. E., crossing some fairly deep-cut valleys with
ice, and slowly ascended in the direction of the pass, which by and by turned to the
S. E. and south. To the east a labyrinth of hills is seen with numerous small valleys
going to the central parts of the large plain. The rock was yellowish white and
light reddish chalk-limestone. Crossing innumerable small erosion furrows, we finally
go up to the little pass of Sarya-la, a flat and comfortable saddle of greenish grey
sandstone. Pan. 108, Tab. 19, shows the view to the south from the pass.

The valley going down from the pass, is at first directed to the E. S. E. and
receives several branches from the trough to the west of the road, which must all
be crossed. Here two tents and some sheepfolds were passed, as usual, placed as
much as possible to the lee side of the prevailing S. W. wind. The convex part of
the stone-folds for the sheep, therefore, was directed to the S. W. The pass valley
runs to the S. E. and our road goes south over slopes consisting of hard yellow
clay and dust, with grass. To the west we see the rocky range we have just tra-
versed in the Sarya-la. Not very far eastwards this range seems to come to an
end. From its eastern part, some erosion beds go down to the plain east of
Camp XCII. This camp was pitched at the base of hills giving some lee from the
wind. There was the ice-sheet of a spring. Grass and fuel was found at some
distance. In the neighbourhood, were two Tibetan tents. It is impossible to describe

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