CONTENTS.
| CHAPTER | PAGE | |
|---|---|---|
| I. | [In the Beginning] | 1 |
| II. | [The Composition of Coal] | 6 |
| III. | [When Coal was Formed] | 14 |
| IV. | [How the Coal Beds Lie] | 22 |
| V. | [The Discovery of Coal] | 35 |
| VI. | [The Introduction of Coal into Use] | 51 |
| VII. | [The Way into the Mines] | 75 |
| VIII. | [A Plan of a Coal Mine] | 94 |
| IX. | [The Miner at Work] | 112 |
| X. | [When the Mine Roof Falls] | 127 |
| XI. | [Air and Water in the Mines] | 147 |
| XII. | [The Dangerous Gases] | 159 |
| XIII. | [The Anthracite Coal Breaker] | 176 |
| XIV. | [In the Bituminous Coal Mines] | 192 |
| XV. | [The Boy Workers at the Mines] | 204 |
| XVI. | [Miners and their Wages] | 222 |