[CHAPTER XV.] A TALE OF THE COLORADO
[CHAPTER XVI.] ZEB CUMMINGS
[CHAPTER XVII.] IN THE LABORATORY
[CHAPTER XVIII.] INTO THE STORM
[CHAPTER XIX.] THE "LIGHTNING CAGE"
[CHAPTER XX.] THROUGH THE AIR
[CHAPTER XXI.] VAULTING TO THE RESCUE
[CHAPTER XXII.] "Z. 2. X."
[CHAPTER XXIII.] ON THE BORDER LINE
[CHAPTER XXIV.] "THE THREE BUTTES"