Chapter 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