CONTENTS TO VOLUME XL VI. 



Number 271. 



Page 

 Art. I. — The American Journal of Science from 1818 to 1918; 



by Edward S. Dana _ 1 



II. — A Century of Geology, 1818-1918: Historical Geology; 



by Charles Schuchert 45 



III. — A Century of Geology: Steps of Progress in the Inter- 

 pretation of Land Forms; by Herbert E. Gregory 104 



IV. — A Century of Geology : The Growth of Knowledge of 



Earth Structure; by Joseph Barrell... 133 



V. — A Century of Government Geological Surveys ; by 



George Otis Smith .__ 171 



VI. — The Development of Vertebrate Paleontology ; by 



Richard S. Lull ._„_ _.. 193 



VII. — The Rise of Petrology as a Science; by Louis V. 



Pirsson _ _ _ 222 



VIII.— The Growth of Mineralogy from 1818 to 1918; by 



William E. Ford . _ 240 



VHIa. — The Work of the Geophysical Laboratory of the 



Carnegie Institution of Washington; by R. B. Sosman_ 255 



IX. — The Progress of Chemistry during the past One Hun- 

 dred Years; by H. L. Wells and H. W. Foote 259 



X. — A Century's Progress in Physics; by Leigh Page 303 



XI. — A Century of Zoology in America; by Wesley R. Coe 355 



XII. — The Development of Botany as shown in this Journal; 



by George L. Goodale _ _ _ 399 



Errata. 

 Page 34, line 10 (bottom), for 27, 40b, 1835, read 27, 406, 1835. 

 Page 37, line 3 (bottom), also page 40, line 8, for George W. read George 



L. Goodale. 

 Page 38, line 9, for 35, 181, 1855, read 35, 181, 1888. 

 Page 10 near bottom, after 1818, American Journal etc., add the line : 

 1818 — . Flora, or Allgemeine botanische Zeitung. Regensburg, Munich. 



