| | Page |
| Prefatory Note | [vii] |
| I. | The American Journal of Science from 1818 to 1918. Edward Salisbury Dana | [13] |
| II. | A Century of Geology: The Progress of Historical Geology in North America. Charles Schuchert | [60] |
| III. | A Century of Geology: Steps of Progress in the Interpretation of Land Forms. Herbert E. Gregory | [122] |
| IV. | A Century of Geology (continued): The Growth of Knowledge of Earth Structure. Joseph Barrell | [153] |
| V. | A Century of Government Geological Surveys. George Otis Smith | [193] |
| VI. | On the Development of Vertebrate Paleontology. Richard Swann Lull | [217] |
| VII. | The Rise of Petrology as a Science. Louis V. Pirsson | [248] |
| VIII. | The Growth of Mineralogy from 1818 to 1918. William E. Ford | [268] |
| IX. | The Work of the Geophysical Laboratory of the Carnegie Institution of Washington. R. B. Sosman | [284] |
| X. | The Progress of Chemistry during the Past One Hundred Years. Horace L. Wells and Harry W. Foote | [288] |
| XI. | A Century’s Progress in Physics. Leigh Page | [335] |
| XII. | A Century of Zoology in America. Wesley R. Coe | [391] |
| XIII. | The Development of Botany since 1818. George L. Goodale | [439] |