"A printing press?" cried several of the others.
"Yes. But that doesn't solve the mystery of what the press was used for."
It was damp and unwholesome in the cave, and they were glad enough to leave it and come out into the sunlight once more. They walked back to where they had left their horses, and here procured lunch, and fed all of the animals, including Wags.
Slowly the afternoon wore away. It began to grow cloudy, and so became dark at an early hour.
"We may as well start," said Dick at last. "We can go to the edge of the woods, anyway."
"I suppose you don't know when you will be back," said Tom.
"No, but probably in three or four hours."
"Take good care of yourselves."
"We'll try to do that," put in Sam.
"If I were you, I'd not expose myself," was Fred's advice. "Those chaps are rough customers, and there is no telling what they would do if they caught you spying on them."