“We can’t do it,” objected Fred. “We can’t carry him down this hill.”

“But suppose we’re attacked,” said Grant dolefully.

“We’ll have to run that risk.”

“I’m going into the cave,” George announced suddenly.

“Pop!” cried Grant in alarm. “You stay where you are.”

“Why not go in and clear up the mystery right now?” said George. “We might just as well.”

“You’re crazy,” exclaimed Fred. “Don’t think of such a thing.”

“Nothing hurt John,” said George soberly.

“Yes,” cried Grant, “but look at him now. He was scared almost to death!”

The three boys gazed apprehensively at the entrance of the cave. They all had rocks in their hands now and were ready to let them fly the moment the man John had seen should show his head. Nothing appeared, however.