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0360 The Pulse of Asia : vol.1
アジアの鼓動 : vol.1
The Pulse of Asia : vol.1 / 360 ページ(カラー画像)

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doi: 10.20676/00000233
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across instead of down the main slope. If such were the
case, whenever the stream accidentally broke through the
retaining wall of sand, it would swing to the right. It would
thus gradually assume a normal course in the lowest part
of the basin.

Coming now to evidence as to variations in the size of the
lake, we have first the ancient name, the Great Salt Lake.
The old Chinese, however, also called Lop-Nor a "marsh,"
and the "Lake of Reeds," which seems very contradictory,
unless these names were applied during the arid period
after the fall of Lulan. The history of the first Han Dynasty,
written, it will be remembered, about the beginning of the
Christian era, gives the size of the lake as seventy-five
miles each way. At this time, Lulan must have consumed
much of the river for irrigation, which would naturally
lessen the area of open water. A later record of unknown
date, but perhaps belonging to the centuries of great aridity,
gives the size of the lake as only fifty miles by twenty-five,
and another as one hundred miles in circumference, which
comes to nearly the same thing. Whether these figures refer
to the entire marsh, or only to the area of open water, is un-
certain. Hedin gives the size of the modern Kara Koshun
as seventy-five miles by eighteen, including all the marshy
tract, which, he says, comprises nine tenths of the entire
area. Przhevalski gives sixty or seventy miles by thirteen,
but his map diminishes this. So far as any conclusion is
justifiable from such meagre data, it appears that, in the
very earliest times, Lop-Nor was larger than now, in spite
of the greater population known to have existed then on the
Tarim and its upper tributaries. Somewhat later, at an