By Roy Rockwood #4 in the "Great Marvel Series"
CHAPTER I TWO CHUMS
CHAPTER II JACK MAKES OXYGEN
CHAPTER III WASHINGTON MEETS THE BOYS
CHAPTER IV WONDERFUL PLAN
CHAPTER V THE SECRET POWER
CHAPTER VI BUILDING THE PROJECTILE
CHAPTER VII AT TERRIFIC SPEED
CHAPTER VIII A MYSTERIOUS THEFT
CHAPTER IX A CRAZY MACHINIST
CHAPTER X WASHINGTON IS AFRAID
CHAPTER XI A STRANGE EXPLOSION
CHAPTER XII THE ELECTRIC REMEDY
CHAPTER XIII AN ALARMING THREAT
CHAPTER XIV OFF FOR MARS
CHAPTER XV SOMETHING ABOUT MARS
CHAPTER XVI THROUGH THE ETHER
CHAPTER XVII A BREAKDOWN
CHAPTER XVIII A VAIN SEARCH
CHAPTER XIX ESCAPING A COMET
CHAPTER XX THE MOTOR STOPS
CHAPTER XXI MARS AT LAST
CHAPTER XXII QUEER PEOPLE
CHAPTER XXIII THE RED LIGHT
CHAPTER XXIV A MARVELOUS SUBSTANCE
CHAPTER XXV SEEKING THE TREASURE
CHAPTER XXVI IN PERIL
CHAPTER XXVII GETTING THE CARDITE
CHAPTER XXVIII THE ATTACK
CHAPTER XXIX THE REPULSE
CHAPTER XXX THE ESCAPE CONCLUSION
