CONTENTS
[CHAPTER I. In the Burning Breaker]
[CHAPTER II. A Fearful Ride]
[CHAPTER III. The Mine Boss Takes Derrick into his Confidence]
[CHAPTER IV. Introducing Harry, the Bumping-mule]
[CHAPTER V. Attacked by Enemies, and Lost in the Mine]
[CHAPTER VI. The Secret Meeting.—A Plunge down an Air shaft]
[CHAPTER VII. A Cripple's Brave Deed]
[CHAPTER VIII. Derrick Sterling's Splendid Revenge]
[CHAPTER IX. Socrates, the Wise Mine Rat]
[CHAPTER X. In the Old Workings.—Misled by an Altered Line]
[CHAPTER XI. A Fatal Explosion of Fire-damp]
[CHAPTER XII. The Mine Boss in a Dilemma]
[CHAPTER XIII. Ladies in the Mine.—Harry Mule's Sad Mishap]
[CHAPTER XIV. A Life is Saved and Derrick is Promoted]
[CHAPTER XV. A "Squeeze" and a Fall of Rock]
[CHAPTER XVI. Bursting of an Underground Reservoir]
[CHAPTER XVII. Imprisoned in the Flooded Mine]
[CHAPTER XVIII. To the Rescue!—A Message from the Prisoners]
[CHAPTER XIX. Restored to Daylight]
[CHAPTER XX. Good-by to the Colliery]
ILLUSTRATIONS
[Transcriber's note: Illustrations were not available]
["Here, lad, lead this mule down the rest of the way, will ye?"]
[Suddenly there came a blinding flash, a roar as of a cannon]