Cambrtvge Gniverstty Press 
Fossil. Plants. A Text-Book for Students of Botany and Geology. 
By A. C. Sewarp, M.A., F.R.S. In4vols. Demy 8vo. Vol. I. With 112 illustrations. 
$4.80. Vol. II. With 266 illustrations. $7.00. Vol. III. With 253 illustrations. $8.00. 
Vol. IV. With 100 illustrations. $9.00. 
Palaeontology—Invertebrate. By Henry Woops, M.A., F.G.S. Crown 8vo. Fifth 
edition. Revised and enlarged, with 173 illustrations. $5.00. 
Petrology for Students: an Introduction to the Study of Rocks under 
the Microscope. By Atrrep Harker, M.A., F.R.S., F.G.S. Fifth edition, revised. 
Crown 8vo. $3.40. 
A Treatise on Crystallography. By W. J. Lewis, M.A. Demy 8vo. $6.40. 
The Principles of Stratigraphical Geology. By J E. Marr, ScD., F.R.S., F.G.S. 
Crown 8vo. $3.40. 
An Introduction to Geology. By J. E. Mire, Se, DRS, MES, Croan Sr. 
$1.80. 
Published by the Cambridge University Press (England) 
The Macmillan Co., Agents in the United States 
64 and 66 Fifth Avenue, New York City 
Ready June 1 
A Source Book for the Economic Geography 
of North America 
By CHARLES C. COLBY 
Assistant Professor of Geography, the University of Chicago 
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The fundamental idea of the book is to make available to the busy teacher the 
material on this subject which is scattered widely through literature. The course which 
has been given for a number of years at the University of Chicago has resulted in the 
collection and organization of the material most suitable for the purpose. 
The book contains short magazine articles and materials from Canadian, Mexican, 
and United States government publications. The selection of the material has been 
governed by the concept that there is a direct relation between the environment and 
___ the economic activities of the region. The author aims to survey the different sections 
' of the country from the viewpoint of industrial opportunity. It is thought that this 
collection of materials will make possible the development of courses in this important 
f subject. 
i Svo, cloth; estimated 300 pages, $3.50, postpaid $3.70 
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| THE INTIS Oe att ee PRESS 
CHICAGO : ILLINOIS 
