When the sky paled behind them and the dawn wind struck their faces, Gray made out that they were in a nest of hillocks. No house was visible. It was waste land, with only an occasional stunted cedar clinging to the side of a clay bank. They had put more than a dozen miles between them and Liangchowfu.

It was now light enough to discern his companions' faces, and Gray halted the cavalcade.

"We will let the mules breathe a bit," he informed the Kirghiz who glanced at him inquiringly. "I will speak with my friend."

He led the animal the scientist was riding a few paces to one side, and tossed off the blanket that enveloped Delabar. The man had awakened, half blue with cold and with retarded circulation due to his cramped position and the effect of the liquor. He peered at Gray from bleared eyes, sobered by the exposure of the past night.

The officer undid the rope that confined Delabar's legs, then seated himself on a stone and lit his pipe.

"Professor," he said meditatively, "you don't know it, but I've been thinking over things in the last few hours. And I've come to a decision. I'll tell you what I've been thinking, because I want you to understand just why I'm doing this."

Delabar was silent, peering at him inquisitively.

"Back on the steamer," resumed Gray, "you showed me that you had nerves—quite a few. Well, lots of men have 'em. Under the circumstances, I can't say I blame you. But at Honanfu your nerves had a severe jolt. Back there"—he jerked his head at Liangchowfu—"you had a bad case of fright. You're all in now."

"I am hungry," complained the scientist. "Why did you tie me to the mule?"

"That skirmish with Wu Fang Chien," continued the officer, ignoring the question, "wasn't more than a good sample of what we may have to face in the Gobi Desert. It showed me you aren't able to go ahead with the trip. You'd be as sick in body as you are now in mind."