r mind. No intelligent youth can fail to read it with
delight and profit."--_The Nation._

HENRY HOLT AND COMPANY
PUBLISHERS NEW YORK

American Science Series

Physics.
By A. L. KIMBALL, Professor in Amherst College.

Physics.
By GEORGE F. BARKER.

Chemistry.
By IRA REMSEN, President of the Johns Hopkins University.

Astronomy.
By SIMON NEWCOMB and EDWARD S. HOLDEN.

Geology.
By THOMAS C. CHAMBERLIN and ROLLIN D. SALISBURY,
Professors in the University of Chicago.

Physiography.
By ROLLIN D. SALISBURY, Professor in the University of Chicago.

General Biology.
By WILLIAM T. SEDGWICK, Professor in the Mass. Institute,
and EDMUND B. WILSON, Professor in Columbia University.

Botany.
By CHARLES E. BESSEY, Professor in the University of Nebraska.

Zoology.
By A. S. PACKARD, Professor in Brown University.

The Human Body.
By H. NEWELL MARTIN.

Psychology.
By WILLIAM JAMES, Professor in Harvard University.

Ethics.
By JOHN DEWEY, Professor in Columbia University and
JAMES H. TUFTS, Professor in the University of Chicago.

Political Economy.
By FRANCIS A. WALKER.

Finance.
By HENRY C. ADAMS, Professor in the University of Michigan.

For full descriptions of the Advanced, Briefer, and Elementary Courses
published under each topic, see the publishers' Educational Catalog.

HENRY HOLT & CO.
34 West 33d Street, N. Y.
378 Wabash Ave., Chicago

Transcriber's Notes

Illustrations have been moved near the relevant section of the text.

Inconsistent use of spacing has been retained for page numbers followed
by "f" or "ff", and for "i.e." / "i. e.", "e.g." / "e. g.", and
"c.f." / "c. f." Inconsistent use of commas following "i.e.", "e.g.",
and "c.f." has also been retained. Inconsistent use of single and
double quotes around words and the placing of punctuation either
within or external to quotes has been left as-is. Capitalization
inconsistencies and grammatical errors relating to subject/verb
agreement were also retained.

Inconsistent hyphenation, accents, and use of separate words have been
retained for "any one" / "anyone", "arm movement" / "arm-movement",
"backstep" / "back-step", "blind spot" / "blind-spot", "by the way" /
"by-the-way", "counting machine" / "counting-machine", "divining rod" /
"divining-rod", "ear movements" / "ear-movements", "eye movement(s)" /
"eye-movement(s)", "eyebrows" /