“I’d like for you to do a little acting,” said Bob to Fekmah, as the youth turned his camera in the direction of the mammoth wall of rock.

The Arab looked up in some surprise.

“I want you to point to the Plateau of Mouydir and talk to Dr. Kirshner,” the young man explained. “Tell him about the legend of the Tuaregs. Meanwhile I’ll be photographing you. Too bad this can’t be a talking picture. All right. Let’s go.”

Fekmah understood and smiled. Dr. Kirshner was also willing to assist the young photographers in their work.

The Arab and the American engaged in conversation, while Bob took movies of them pointing to the high rock. When it was finished, Bob and Joe smiled in satisfaction.

“That’s the kind of scenes we ought to have more of,” Joe said. “They’re different from the usual monotony of ‘shooting’ the country alone.”

“Gives a sort of individuality, huh?” laughed Mr. Holton. “Well, any time we can be of use to you, let us know.”

Camp was made at the very base of the huge rock. Then the usual meal was prepared.

“Use water sparingly,” cautioned Mr. Lewis, as they sat down on the cool sand in the shade of the tent. “Tishmak says we will not come to another well till tomorrow afternoon.”