THE

AMERICAN

JOURNAL OF SCIENCE.

EDITOR: EDWARD S. DANA.

ASSOCIATE EDITORS

PROFESSORS GEORGE L. GOODALE, JOHN TROWBRIDGE,
W. G. FARLOW AND WM. M. DAVIS, OF CAMBRIDGE,

PROFESSORS A. E. VERRILL, HORACE L. WELLS, CHARLES
SCHUCHERT, L. V. PIRSSON, H. E. GREGORY,
AND HORACE S. UHLER, OF NEW HAVEN,

PROFESSOR JOSEPH S. AMES, OF BALTIMORE,
MR. J. S. DILLER, OF WASHINGTON.

FOURTH SERIES

VOL. XLVI-[WHOLE NUMBER, CXCVI].

WITH TWO PLATES

NEW HAVEN, CONNECTICUT.

1918.

THE TUTTLE, MOREHOUSE & TAYLOR COMPANY

NEW HAVEN

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

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

WILLIAM E. FORD...

222

240

VIIIA. 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.

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