I  PAUL AND BOB II  THE BROTHERS' INVENTION III  THE SUCCESSFUL MODEL IV  PLANNING A BIG AIRPLANE V  AN AIR RACE FINISH AND A CHALLENGE VI  THE MISSING BLUE-PRINTS VII  WHO'S AT THE WINDOW? VIII  THE SKY-BIRD II IX  THE TEST FLIGHT X  FINAL PREPARATIONS XI  OFF FOR PANAMA XII  FIGHTING A DEVIL-FISH XIII  THE STRANGE AIRPLANE XIV  A FAMILIAR FACE XV  THE START XVI  TRICKED BY RIVALS XVII  ACROSS THE ATLANTIC XVIII  AN IRRITATING DELAY XIX  SAVED BY THE SEARCHLIGHT XX  A JUNGLE ADVENTURE XXI  THE DOUBLE LOOP XXII  ABOVE THE CLOUDS XXIII  BOMBED BY ROCKS XXIV  RIDING AN AIRPLANE'S TAIL XXV  ENGULFED IN A VOLCANO'S DUST XXVI  IN AUSTRALIA XXVII  PAUL VERSUS PETE XXVIII  A MIX-UP IN DATES XXIX  A FLYING RESCUE XXX  AN ALARMING DISCOVERY XXXI  THE FINISH