“Those fellows would think nothing of killing all of us,” said Mr. Lewis gravely. “So we want to be ready for anything that might happen.”

As the Arabs came nearer, their leader shouted something to Tishmak, whose jaw dropped in surprise and astonishment.

Tishmak turned to Fekmah and conversed rapidly. Then Fekmah translated to the Americans.

“They want two of our camels,” he said nervously.

Dr. Kirshner gasped in amazement.

“Want two of our camels?” he cried, his voice indicating a high state of anger.

“What for?” demanded Bob.

“They say theirs are too much loaded,” Fekmah answered. “Want to spread out packs on more camels.”

“Well, of all the nerve!” exclaimed Mr. Holton. “Tell them to get out of here—and get out quick, or we’ll fill them full of holes!”