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 why the spot is isolated. The Chinese have leper colonies."

"Yes," assented Gray. Neither man voiced the thought that was uppermost in his mind, that Mary had been seized by these men. "Mirai Khan told me that Sungan was an unclean place. The Kirghiz—who are fairly free from the disease—avoid Sungan. Delabar, my companion, feared it, I think."

"This explains the myth of the white race in the Gobi—perhaps. And the guards."

"Mirai Khan said that men were brought from China, from the coast, to the sands of Sungan," added Gray grimly. "God—why didn't they warn us?"

"You were warned, Captain Gray. Our caravan traveled as secretly as possible. I—I paid no attention to what the Chinese said. They have their secrets. I should have been more cautious. I made the mistake of my race. Overconfidence in dealing with natives. I wanted to be the first white man in Sungan."

He paused, reaching for a cup of water that Gray had filled for him. The American watched him blankly. So the talk of the pale sickness had proved to be more than legend. And he had discovered the root of Delabar's dread of the Gobi. Why had not the scientist said in so many words that Sungan was a leper colony? Doubtless Delabar had known that Gray would not turn back until