chnical Institutions.

Raymond's Plane Surveying

By W.G. RAYMOND, C.E., Member American Society of Civil
Engineers, Professor of Geodesy, Road Engineering, and Topographical
Drawing in Rensselaer Polytechnic Institute.

Cloth, 8vo. 485 pages. With Tables and Illustrations $3.00

A modern text-book for the study and practice of Land, Topographical,
Hydrographical, and Mine Surveying. Special attention is given to such
practical subjects as system in office work, to labor-saving devices, to
cooerdinate methods, and to the explanation of difficulties encountered
by young surveyors. The appendix contains a large number of original
problems, and a full set of tables for class and field work.

Todd's New Astronomy

By DAVID P. TODD, M.A., Ph.D., Professor of Astronomy and
Director of the Observatory, Amherst College.

Cloth, 12mo. 500 pages. Illustrated $1.30

A new Astronomy designed for classes pursuing the study in High Schools,
Academies, and other Preparatory Schools. The treatment throughout is
simple, clear, scientific, and deeply interesting. The illustrations
include sketches from the author's laboratory and expeditions, and
numerous reproductions from astronomical photographs.

_Copies 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

* * * * *

Birds of the United States

A Manual for the Identification of Species East of the Rocky Mountains

By AUSTIN C. APGAR

Author of "Trees of the Northern United States," etc.

Cloth, 12mo, 415 pages, with numerous
illustrations. Price, $2.00

The object of this book is to encourage the study of Birds by making it
a pleasant and easy task. The treatment, while thoroughly scientific and
accurate, is interesting and popular in form and attractive to the
reader or student. It covers the following divisions and subjects:

PART I. A general description of Birds and an explanation of
the technical terms used by ornithologists.

PART II. Classification and description of each species with
Key.

PART III. The study of Birds in the field, with Key for their
identification.

PART IV. Preparation of Bird specimens.

The descriptions of the several species have been prepared with great
care and present several advantages over those in ot