[CHAPTER XXV.] INTO THE BEYOND
[CHAPTER XXVI.] THE START FOR THE UNKNOWN
[CHAPTER XXVII.] THE PROFESSOR'S SECOND DILEMMA
[CHAPTER XXVIII.] THE UPPER REGIONS
[CHAPTER XXIX.] A MUD BATH
[CHAPTER XXX.] NIGHT ON THE COLORADO
[CHAPTER XXXI.] THE ISLAND OF MYSTERY
[CHAPTER XXXII.] THROUGH THE WOODS
[CHAPTER XXXIII.] THE SECRET AT LAST
[CHAPTER XXXIV.] THE INTERLOPERS