| I. | In a Coal Mine | 1 | | II. | Down in the Quarries | 11 | | III. | Houses of Sand | 21 | | IV. | Bricks, their Faults and their Virtues | 31 | | V. | At the Gold Diggings | 39 | | VI. | The Story of a Silver Mine | 48 | | VII. | Iron, the Everyday Metal | 57 | | VIII. | Our Good Friend Copper | 65 | | IX. | The New Metal, Aluminum | 76 | | X. | The Oil in our Lamps | 84 | | XI. | Little Grains of Salt | 95 |
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