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 dans away from the place. Since the late rebellion Mohammedan and Chinese had frequently taken up arms against each other—they had never been on friendly terms. Evidently the Buddhists, for some reason, took pains to keep this part of the desert to themselves.

They even guarded it against intrusion—as Brent had discovered.

And Brent had died of sickness. What was the pale sickness? Were men inflicted with it brought to the Gobi—the dreariest stretch of land on the surface of the earth?

Gray nodded sleepily. The riddles presented no answer. He determined that he would learn the truth for himself. Wearied with his exertions, he was soon asleep. Silence held the camp, the brooding silence of great spaces, the threshold of infinity which opens before the wanderer in the Gobi. The wind stirred the sand into tiny spirals that leaped and danced, like dust wraiths across the gully, powdering the blankets of the sleeping men and the rough coats of the mules.

Along the summit of the ridge a shadow passed across the stars. It hesitated to leeward of the embers of the fire, and the jackal crept on. The crescent moon moved slowly overhead, throwing a hazy half-light on the surface of the sand, and picking out the bleached bones of an antelope.

Night had claimed the Mongolian steppe.