For some distance the way was along good firm sand, and they got over several miles before the heat became too much for Lawrence, who was glad to sit down under the shade of a low cliff facing the sea and nibble one of the biscuits that had been pretty well soaked with sea-water, and drink from a rivulet whose presence suggested the halt.

When the heat of the day had somewhat abated the journey was continued; and, at last, when the night was beginning to fall and arrangements had to be made for sleep, the outlook was very black, for they were in a very desert place, and, though Yussuf and the professor both climbed eminences from time to time, there was not a trace of human habitation, while their supply of food was growing very short.

“Never mind,” said the professor cheerily. “Let’s have a good night’s rest. I don’t think we need set a watch here, eh, Yussuf?”

“It is always better to do so, effendi,” said the Muslim, in his quiet thoughtful manner; “there is a great ridge of rocks yonder in front, and who knows what may be on the other side.”

“But no one has seen us come here; and if they had, we have not much to lose.”

“Except the Turkish gold the two excellencies have in the belts round their waists,” said Yussuf quietly.

Mr Preston started at this, but said nothing then. Later on he found that his thoughts had been shared upon the subject, for, as they sat close up to a projecting cliff, Mr Burne leaned towards him and whispered:

“Did you tell the guide that you had a lot of money in your cash-belt?”

“No. Did you?”

“No.”