Both of the American boys had heard of those desert wanderers and marauders, but now, for the first time, they beheld genuine wild Bedouins at home.

The Syrians and Arabs of the train seemed in great fear and consternation, for they saw the approaching body of men outnumbered them, and it was impossible to know the purpose of the wild horsemen.

The Bedouins wore loose, flowing garments and hoods on their heads. They were all armed to the teeth, as is the habit of the desert Bedouin.

Dick was thrilled by the picturesque spectacle. He had seen pictures of Bedouin riders, and he was forced to confess that he was not disappointed in the real article.

The merchants huddled their loaded camels together and waited in helpless suspense for what was to take place.

Without waiting for his camel to kneel, Zenas Gunn slid down to the ground, risking both neck and limb, and fell sprawling. He gathered himself up and rushed forward to Dick and Brad.

“We’re all going to be murdered!” he spluttered. “Those wretches are going to kill us and plunder the train!”

Dick forced the camel to kneel, after the manner of camel drivers, a trick he had learned by observation. Down went one end of the beast, flinging the boys forward and forcing them to hold fast with all their strength; then down went the other end, hurling them back and snapping their teeth together.

After that they stepped off.

“It is useless to resist!” moaned the professor. “We have no chance against those wretches! Oh, boys, this is the end—the awful end!”