“Whooo! Whooo! Whooo!”

“I’d swear that was an owl if I didn’t see you do it,” Rex declared.

“Whip-poor-will! Whip-poor-will! Whip-poor-will!”

“Jack can beat me all to hollow when it comes to imitations, but that is a signal we’ve had for a long time,” Bob told him.

It was only a few moments before Jack came trudging in and he gave a loud whoop of joy as he caught sight of Rex.

CHAPTER VIII.
A MYSTERIOUS MESSAGE.

“Well, you sure did give us a good scare,” Jack declared, as he shook his friend’s hand and threw himself down on the ground by his side. “Tell us all about it.”

“Do you think that thing, whatever it was, knew that you were following it?” he asked as soon as Rex had finished his story.

“I don’t know, but it made off through the woods mighty fast. That’s what made me get so far away before I knew it.”

“You might not have been so far away at that,” Bob laughed. “You don’t have to go very far in these woods to get lost if you’re not used to them.”