CONTENTS I. AN APPEAL FOR AID II. MISS NESTOR'S NEWS III. TOM KNOCKS OUT ANDY IV. MR. DAMOM WILL GO ALONG V. VOL-PLANING TO EARTH VI. THE NEW AIRSHIP VII. MAKING SOME CHANGES VIII. ANDY FOGER'S REVENGE IX. THE WHIZZER FLIES X. OVER THE OCEAN XI. A NIGHT OF TERROR XII. A DOWNWARD GLIDE XIII. ON EARTHQUAKE ISLAND XIV. A NIGHT IN CAMP XV. THE OTHER CASTAWAY XVI. AN ALARMING THEORY XVII. A MIGHTY SHOCK XVIII. MR. JENKS HAS DIAMONDS XIX. SECRET OPERATIONS XX. THE WIRELESS PLANT XXI. MESSAGES INTO SPACE XXII. ANXIOUS DAYS XXIII. A REPLY IN THE DARK XXIV. "WE ARE LOST!" XXV. THE RESCUE-CONCLUSION CHAPTER I AN APPEAL FOR AID Tom Swift stepped from the door of the machine shop, where he was at work making some adjustments to the motor of his airship, and glanced down the road. He saw a cloud of dust, which effectually concealed whatever was causing it. "Some one must be in a hurry this morning," the lad remarked, "Looks like a motor speeding along. MY! but we certainly do need rain," he added, as he looked up toward the sky. "It's very dusty. Well, I may as well get back to work. I'll take the airship out for a flight this afternoon, if the wind dies down a bit." The young inventor, for Tom Swift himself had built the airship, as well as several other crafts for swift locomotion, turned to re- enter the shop.