So he kept the gold pieces tied up in his handkerchief and took his ten dollars to a hardware store, where he bought what the Phoenix wanted--a coil of rope, an electric door bell, a pushbutton, and one hundred feet of insulated wire. Then he brought the package home, hid it behind the woodpile in the garage, and sat down to think. Wire--bell--pushbutton. What could the Phoenix possibly want with them? And what was the rope for? And the hatchet? The more he puzzled over it the more confused he became, and finally he just gave up. There was only one thing he was sure about: whatever the Plan was, they would have to carry it out as soon as possible. Two days had passed since the Scientist had shown up. The new gun he had ordered might arrive at any time now. Perhaps even today, when they had been digging up the pirate treasure, the Scientist had got his new rifle and had started to hunt through the mountains. The thought gave David a creepy feeling on the back of his neck. They certainly would have to hurry. * * * * * Early next morning David climbed up to the ledge, bringing with him the coil of rope and the hatchet. As an afterthought he had added a paper bag full of cookies. "Here's the stuff, Phoenix," he called out as he stepped onto the ledge. "Where are you?" There was a crash from the thicket as though someone had jumped up in it suddenly, and the Phoenix stumbled out, rubbing its eyes. "Ah, splendid, my boy! Yes. I was just--ah--Thinking." "Phoenix," said David, "I'm not going to ask you again what your Plan is, because I know you'll tell me when it's time. But whatever it is, we'd better do it right now. The Scientist may show up any minute." "Precisely, my boy. Never put off until tomorrow what can be done today. One of my favorite proverbs. We shall begin immediately--" Here the Phoenix caught sight of the bag in David's hand and added hastily: "But, of course, we must not forget that first things come first." "You might have brought more," said the Phoenix, fifteen minutes later. "There weren't any more in the jar," David said. "Phoenix, please tell me what we're going to do. I don't care if curiosity _did_ kill the cat. I've been thinking about the rope and wire and bell all night, and I can't make heads or tails out of it." The Phoenix gave a pleased laugh. "Of course you cannot, my boy. The Plan is far too profound for you to guess what it is. But set your mind at rest. I shall now explain the rope and hatchet." David leaned forward eagerly. "Now, scientists, you know, have fixed habits. If you know those habits, you can predict just what they will do at any time. Our particular Scientist is a daytime creature--that is to say, he comes at dawn and goes at dusk. His invariable habit, my boy!" "Well?" "There you are, my boy!" said the Phoenix triumphantly. "_We shall sleep during the day and continue your education at night!_"