"A chimney, I suppose?" "Exactly, and it follows that it's hollow." "I suppose so, unless it's been filled up." "It hasn't been filled up," said Page. "When they put modern heating into the house they closed up the fireplace that was here, and I had some notion of opening it again, but I've decided not to." He spoke now in a loud tone of voice, hoping that Merriwell would hear him. "Why not open the fireplace?" asked Ford. "Because I've got a pet that I want to keep there." "A pet?" "Yes. It's just the place for it----" "What is it, a big dog?" "No, though it's big enough." "Queer place to keep a pet," remarked Ford. "How can you get him in there?" "Why, he's in there already." "What! Now?" "Certainly." "I don't hear anything." Page was on the broad grin, and Ford crossed the room out of curiosity. He struck his hand smartly on the chimney, whereat Page exclaimed: "I wouldn't do that, you might frighten him." "But what in the mischief have you got there?" "I'll show you in a minute. Now, then, old boy, want to see the light? Does you want to come out for a little time?" Page spoke soothingly as if he were addressing a small cat. "Shall I let him come out?" he went on, mockingly; "shall I let him have a little taste of fresh air and sunlight, poor thing?" He listened as he spoke for some sign of Merriwell and it bothered him a little that he got no reply. Ford looked on in wonder. "Don't be so long about it!" he exclaimed. "Open up the thing if there's any way to do it, and let's see what you've got." "All right, then; don't be frightened if he should run out suddenly," answered Page. He put his hand on the knob of the secret door, and threw it open; then he stepped back, smiling broadly. "There isn't anything there!" exclaimed Ford. "What!" and Page got down on his knees and thrust his head into the fireplace. Of course he realized in an instant what had happened. He knew that Merriwell must have climbed out at the top. "Great Scott!" he thought, "if Frank should know that I brought a fellow up here to see the foolishness, how he would turn the laugh on me." "Has the thing, whatever it is, vanished?" asked Ford. "Gone completely!" answered Page in a tone of disappointment. "He must have flown out of the top of the chimney." Ford got down, too, and looked up. "Why, yes," he said, "if it was a bird, of course it would get out that way. You ought to have known better than to put a bird in such a place. What was it, a parrot?" "No, not exactly," said Page. "I guess I won't say what it was until I've made some search for it." At this moment there was a knock at the door. Page, still on his hands and knees, answered "Come in." The door opened and in walked Frank Merriwell. CHAPTER IV. READY FOR THE TEST. Page got up looking very sheepish. He expected that Frank would begin to turn the laugh on him. Nothing of that kind happened, for the first moment Ford and Frank were speaking together.