TABLE OF CONTENTS 



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 



YI. On the Development of Vertebrate Paleontology. 



Eichard Swann Lull 217 



VII. The Eise 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. E. B. 

 Sosman 284 



X. The Progress of Chemistry during the Past One 

 Hundred Years.. Horace L. Wells and Harry 

 W. Foote 288 



XL A Century's Progress in Physics. Leigh Page 335 



XII. A Century of Zoology in America. Wesley E. Coe 391 



XIII. The Development of Botany since 1818. George L. 



Goodale ., 439 



