"Not a sign of a pack," replied Charley. "Their coat pockets bulged out as though they had sandwiches or something in them, but they hadn't a thing in their hands or on their backs except fishing-rods and creels." "That settles it," said the ranger. "They can't stay here more than forty-eight hours at the most. And there's no danger of their telling anybody else about your camp because they won't want anybody to know they were here. We'll just consider the camp situation settled." They finished their supper and had begun clear up the dishes when suddenly Charley thought of the fire-clay. "Oh! I have something to show you," he cried, and went to the corner of the tent to get the clay ball. It was just where Charley had left it, but the instant he picked it up he was somehow conscious that it was different. He held the ball up and looked at it critically. Then he hefted it in his hand. "Lew," he exclaimed, "how big was that ball of clay we took for a sample?" "Four or five inches in diameter," rejoined Lew. "Why?" "Look at that. It isn't a bit more than three inches thick. I was sure we had more clay than that. I meant to make a little pot of it." "We did have more. I'm sure of it. You don't suppose those men could have taken any of it, do you?" "Let me see," said the ranger. He took the ball and examined it critically. "That looks like fire-clay. If it is, and the deposit is of any size, you have found something of value. You know the state sells things like that on a royalty basis. We might be able to develop a good clay business. We like to work up all the business we can, because the revenues go toward the purchase of the equipment we need. You know the legislature won't give us all we need to buy implements for fighting fires, and for fire-towers, and other equipment." "If we could make a fire," said Charley, "you could soon tell whether it is good fire-clay or not." "Make a fire," said the ranger. "Collins already knows where our camp is and nobody else will be prowling around here at this hour." In a minute the boys had a fire going. When they had a deep bed of coals, they dropped the ball of clay in it and made more fire on top of the bed. While they were waiting for the clay to bake, Charley sat down at his wireless key. As it was still early in the evening he did not feel certain that any of the Camp Brady boys would be listening in. He called several times with no response, so he threw over his switch and resumed his conversation with his fellows. When he flashed out his signals a quarter of an hour later, however, he got a prompt reply. "I've got 'em," said Charley quietly to his comrades. "And it's Henry talking." He was silent a while, listening to Henry's message. Then he said, "Henry wants to know when Lew is coming home. Vacation is about ended." "Tell him that I think I'll go back with the ranger to-morrow. I've stayed as long as I possibly can."