“They are not anywhere near here on shore,” replied the professor; “and the boat has sailed away. There is only one in sight, miles away yonder. That may be it, but I am not sure.”

“Do you mean to say that those scoundrels have taken advantage of our being asleep to get on board the boat and escape?” said the lawyer angrily.

“That is the only point at which I can arrive,” said the professor. “Look around and judge for yourself.”

The old lawyer looked sharply about him and then walked slowly away.

“A mistake—a mistake,” he muttered; “I ought never to have come upon such a trip. Not fit for it—not fit for it. Disgraceful—disgraceful! I never—never could have believed it of myself.”

He stopped and turned back.

“Send away this man,” he said quickly.

Yussuf turned and walked away without another word.

“Preston,” exclaimed the old lawyer, “I don’t know what to say in my defence. I have nothing to say, only that I never felt anything so bitterly before.”

“Then say nothing,” replied Mr Preston coldly. “You were overcome by sleep, and no wonder. But it was a terrible risk to run. Fortunately these men were cowed by what had previously taken place, and they could not know but what we were keeping a good watch.”