[CHAPTER XIV—A MESSAGE FROM THE AIR]

[CHAPTER XV—A DASH ALOFT]

[CHAPTER XVI—INTO THE ENEMY’S CAMP]

[CHAPTER XVII—“DAD!—IT’S JACK!”]

[CHAPTER XVIII—HEMMED IN BY FLAMES]

[CHAPTER XIX—“STAND BY FOR A ROPE!”]

[CHAPTER XX—A RESCUE BY AIRSHIP]

[CHAPTER XXI—ALOFT IN THE STORM]

[CHAPTER XXII—A VOYAGE OF TERROR]

[CHAPTER XXIII—THE BOY INVENTORS SOLVE A PROBLEM]