| [ CHAPTER I. ] | NATURE IN TRAVAIL. |
| [ CHAPTER II. ] | PROFESSOR FEATHERWIT TAKING NOTES. |
| [ CHAPTER III. ] | RIDING THE TORNADO. |
| [ CHAPTER IV. ] | THE PROFESSOR'S LITTLE EXPERIMENT. |
| [ CHAPTER V. ] | THE PROFESSOR'S UNKNOWN LAND. |
| [ CHAPTER VI. ] | A BRACE OF UNWELCOME VISITORS. |
| [ CHAPTER VII. ] | THE PROFESSOR'S GREAT ANTICIPATIONS. |
| [ CHAPTER VIII. ] | A DUEL TO THE DEATH. |
| [ CHAPTER IX. ] | GRAPPLING A QUEER FISH. |
| [ CHAPTER X. ] | RESCUED AND RESCUERS. |
| [ CHAPTER XI. ] | ANOTHER SURPRISE FOR THE PROFESSOR. |
| [ CHAPTER XII. ] | THE STORY OF A BROKEN LIFE. |
| [ CHAPTER XIII. ] | THE LOST CITY OF THE AZTECS. |
| [ CHAPTER XIV. ] | A MARVELLOUS VISION. |
| [ CHAPTER XV. ] | ASTOUNDING, YET TRUE. |
| [ CHAPTER XVI. ] | CAN IT BE TRUE? |
| [ CHAPTER XVII. ] | AN ENIGMA FOR THE BROTHERS. |
| [ CHAPTER XVIII. ] | SOMETHING LIKE A WHITE ELEPHANT. |
| [ CHAPTER XIX. ] | THE CHILDREN OF THE SUN GOD. |
| [ CHAPTER XX. ] | THE PROFESSOR AND THE AZTEC. |
| [ CHAPTER XXI. ] | DISCUSSING WAYS AND MEANS. |
| [ CHAPTER XXII. ] | A DARING UNDERTAKING. |
| [ CHAPTER XXIII. ] | A FLIGHT UNDERGROUND. |
| [ CHAPTER XXIV. ] | THE SUN CHILDREN'S PERIL. |
| [ CHAPTER XXV. ] | WALDO GOES FISHING. |
| [ CHAPTER XXVI. ] | DOWN AMONG THE DEAD. |
| [ CHAPTER XXVII. ] | PENETRATING GRIM SECRETS. |
| [ CHAPTER XXVIII. ] | BROUGHT BEFORE THE GODS. |
| [ CHAPTER XXIX. ] | BENEATH THE SACRIFICIAL STONE. |
| [ CHAPTER XXX. ] | AGAINST OVERWHELMING ODDS. |
| [ CHAPTER XXXI. ] | DEFENDING THE SUN CHILDREN. |
| [ CHAPTER XXXII. ] | ADIEU TO THE LOST CITY. |
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