1087 pages. 1575 illustrations $5.00

This great work was thoroughly revised and entirely rewritten under the
direct supervision of its author, just before his death. It is
recognized as a standard authority, and is used as a manual of
instruction in all higher institutions of learning.

Le Conte's Compend of Geology

By JOSEPH LE CONTE, LL.D. Cloth, 12mo, 399 pages $1.20

Designed for high schools, academies, and all secondary schools.

Steele's Fourteen Weeks in Geology

By J. DORMAN STEELE, Ph.D. Cloth, 12mo, 280 pages $1.00

A popular book for elementary classes and the general reader.

Andrews's Elementary Geology

By E.B. ANDREWS, LL.D. Cloth, 12mo, 283 pages $1.00

Adapted for elementary classes. Contains a special treatment of the
geology of the Mississippi Valley.

_Copies of any of the above books will be sent, prepaid, to any address
on receipt of the price by the Publishers:_

American Book Company

NEW YORK . CINCINNATI . CHICAGO

* * * * *

A New Astronomy

BY

DAVID P. TODD, M.A., Ph.D.

Professor of Astronomy and Director of the Observatory, Amherst College.

Cloth, 12mo, 480 pages. Illustrated Price, $1.30

This book is designed for classes pursuing the study in High Schools,
Academies, and Colleges. The author's long experience as a director in
astronomical observatories and in teaching the subject has given him
unusual qualifications and advantages for preparing an ideal text-book.

The noteworthy feature which distinguishes this from other text-books on
Astronomy is the practical way in which the subjects treated are
enforced by laboratory experiments and methods. In this the author
follows the principle that Astronomy is preeminently a science of
observation and should be so taught.

By placing more importance on the physical than on the mathematical
facts of Astronomy the author has made every page of the book deeply
interesting to the student and the general reader. The treatment of the
planets and other heavenly bodies and of the law of universal
gravitation is unusually full, clear, and illuminative. The marvelous
discoveries of Astronomy in recent years, and the latest advances in
methods of teaching the science, are all represented.

The illustrations are an important feature of the book. Many of them are
so ingeniously devised that they explain a