had full title to it he need not worry any more, nor drive away those whom he thought might try to cheat him out of the property.
Mr. Houghton had explained the queer machines in the secret room, and had told how he used to photograph wild animals at night. A few days afterward he showed the boys how he set the cameras in the wood, with a string which the animals themselves would break, thus setting off the flashlight and taking their own picture.
Mr. Jessup made some inquiries, and found out that the secret room in the old mansion had been built by the former owner of it. He had no particular use for it, but it was just a notion on his part to have it made. Mr. Houghton had accidentally discovered it, just as Sammy had done.
As for the young man who had taken things from Mr. Jessup's camp, he was not heard of again. After all, he had not taken a great deal, and his plan of using a long pole with a hook on it explained why he had never left any marks. He could reach in the window or door of the cabin when Mr. Jessup was away, and get what he wanted. He had been in the habit of staying in the secret room when Mr. Houghton did not sleep there.
"Well, as long as everything is explained, we may as well go back to camp," said Sammy, when they left the old mansion.
"Yes, I guess so," agreed Mr. Jessup. "You boys are entitled to some fun after your hard work."
"Yes, and they're entitled to more than that," said Mr. Addison, a little later. "I owe them something for helping take care of me," and some time afterward, when the Mineral Spring Company was formed, he sent each of the boys a nice present.
"Well, now we'll take it easy," suggested Sammy, when
