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Show - Asia's Pendulum Lake. Among the many interesting discoveries dis-coveries of Dr. Sven He4in in Central Asia is a singular oscillation in the position of the lake of Kara-koahum, or Lop-nor. This lake seems as rest less as some rivers that change their beds, but the cause of its movements is a secular change in the level of the desert, in the midst of which it lies, bordered by vegetation. At present pres-ent this lake is retreating northward from the place where Prjevalsky found it, and creeping toward its ancient bed, where it is known to have lain in the third century of the Christian e.-a; and as it slowly moves, the . .vegetation,, the animals "and the 'fishermen with their reed huts follow its shores northward. Dr. Hedin believes that after reaching the northern part of the desert the lake returns southward, the period of oscillation being 1,000 years or more. |