“What do you mean?” exclaimed the Doctor sharply.

“Only that Joses woke up, sir, and I found him watching that mass of rock which you can see out yonder. That one sir—or—no!—I can’t see it now.”

“Why?” said the Doctor, in a quick low decisive tone; “is it darker now?”

“Very little, sir; but perhaps Joses was right: he said he thought there must be a fire out there to make it stand out so clearly, and—”

“Well? speak, my boy! Be quick!”

“Perhaps he was right, sir, for I cannot see the rock there at all.”

“Where is Joses? Why did he not go and see?” exclaimed the Doctor sharply.

“He has been gone nearly an hour, sir, and I was expecting him back when you came.”

“That’s right! But which way? Joses must feel that there is danger, or he would not have left the camp like this.”

Bart pointed in the direction taken by their follower, and the Doctor took a few hasty strides forward, as if to follow, but he came back directly.