“No; I feel sure that we got away unseen, and in an hour it will be so still that you can hear the slightest sound.”

“And so dark that an enemy could not find us.”

“Till the moon rises,” said Bourne, “and then I come on. I say, doctor, you’re going to have as idle a time as the boys.”

“And I’m sure father wants it,” said Chris sharply; “he nearly works himself to death.”

“And never felt better in my life,” said the doctor, with a pleasant laugh. “This mountain air is glorious after the work in those dreary salt plains. But thank you all the same, Chris, my boy; you’ll take care that I am not quite worked to death, eh?”

“You won’t let me,” said the boy quickly.

“No,” replied the doctor. Then changing the subject, he turned to Griggs. “Just a word with you, neighbour,” he said. “You feel pretty confident about to-night, don’t you?”

“Yes; we’ll have a good rest, and to-morrow—”

“Well, what about to-morrow?” said the doctor, for the American paused.

“Strike right off to the south.”