Presently they pulled up by the rock, practically neck and neck. Their eyes were alight now with the zest of adventure.

"Gee, it's great to be alive," cried Frank.

"You said it," declared Bob.

Jack nodded laughingly, but the next moment his face became grave.

"Just the same," he said, "we mustn't do that again."

"Why not?" demanded Bob.

"Well, for one thing, we must save our horses as much as possible. We already have come twenty miles, and we have thirty miles more to go before reaching Tom's cave."

"For one thing?" questioned Bob. "What's your other reason?"

"Just that we don't want to draw attention to ourselves."

"You're right, Jack," said Frank. "I'll not start anything again."