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| 0474 |
Southern Tibet : vol.4 |
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billions of dust particles kept in suspension in the air and carried horizontally by
the wind. When witnessing this procedure day by day from month to month and
remembering that the same action has gone on since geological ages, one easily
understands that the result can be but one, viz. the destruction of the relief of the
whole country and the very far-gone denudation, the results of which meet our eyes
everywhere, and which are so plainly visible on the long series of panoramas in my
atlas. The student of physical geography who, in following my narrative day by
day, has had the same patience as I had in performing the journey and sketching
these panoramas in killing wind and bitter cold, will no doubt admit, that the panoramas
give him a much clearer idea of the orographical morphology of Tibet than all the
narratives of explorers put together. For no description in words can give so clear a
conception of reality as a drawing or a photograph. But in this winter weather it
was, as a rule, difficult to photograph, and, therefore, the panoramas and a few water
colour sketches have to compensate a lack of the former.¹
On March 6th, we marched 10 km. S. E. and S. S. E., sinking only 41 m. or
to 4,663 m., being at a rate of 1:244. In the night the temperature went down
to —23.6°, and in the morning the air was absolutely clear and the sky as blue as
turquoise. It should be noted that in spite of continual daily storms going on for
weeks, the air after only one night's calm weather, becomes as clear and transparent
as ever, allowing mountains at several days' distance to appear with perfectly sharp
contour-lines and details. To a certain extent, this may depend upon the cold of
the nights. After a severe storm in the region of Lop-nor, on the contrary, fine
dust is kept in suspension for many days, and the air, even if perfectly calm, is so
thick, that it would be impossible to tell where the sun has her place. At 9.15 o'clock a. m.
the S. W. storm broke out. The dust clouds had a gloomy brownish red colour.
The wind gusts occasionally blew down with such violence and force as to dig out
furrows in the ground, like ploughshares. Sometimes spirals are seen in the ground
which can only have been dug out by cyclonic winds. Whether the shallow holes
of two or three meters in diameter also are a work of the wind or of some other
agency I could not tell. The kyangs seem to love them, for there was always
much dung of these animals in the holes. It is of course possible that the dung
is blown thither by the wind.
Leaving Camp CCCXLVI which was also a well-known camping ground of
the nomads, we crossed three small ridges, not more than about 20 m. above the
camp. To our left is a little pool only a few hundred meters in length. It was
frozen all over and the ice was covered with wind-driven dust. The pool would,
therefore, never have been noticed if we had not examined the place. Two other
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707
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725
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736
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746
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756
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