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| 0248 |
The Pulse of Asia : vol.1 |
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first, and then the sand of the desert begins to encroach.
Throughout an area of many square miles around Dandan-
Uilik, half, more or less, of the dead vegetation is not cov-
ered by sand at all, or at most only by dunes from two to
five feet high. Such dunes, accumulating slowly as they
must, could not possibly kill vigorous tamarisks, and much
less large poplars. On the borders of the zone of vegetation,
where ground-water is comparatively near the surface, I
saw literally scores of places where the advance of sand
had been checked by plants, and dunes had accumulated
to a height of fifteen feet or more. In such cases, the vege-
tation was interfered with somewhat, but the stronger
plants, including even the reeds, had responded to the exi-
gency, and had lengthened their stems so as to keep above
the drifts. Where the sand had passed by, new vegetation
had sprung up in the hollows to replace the weak plants
which had been killed. If, as at Dandan-Uilik, the vegeta-
tion of a region is all dead, and especially if it has died
where there is not sand enough to injure it greatly, it is
safe to say that the encroachment of sand has nothing
to do with the matter. It is an effect rather than a cause.
The true explanation of the dead vegetation and of the
peculiar location of the ruins of Dandan-Uilik and Rawak
seems to be that the water supply has been diminished by
a change of climate.
After our trying experience in the desert, we rested a day,
October 1, under the poplars beside the Keriya River.
The air was of so perfect a temperature that one did not
feel too cool in the shade or too warm in the sun. From
our camp we looked out between two massive poplars at
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