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.