POSITIONS OF ALL KINDS 
Never was the demand so great for qualified teachers and 
specialists. For ten years we have given our time and 
energy to this work. Write for our free literature. State 
qualifications briefly. 
Co-operative Instructors’ Association 
Marion - Indiana 
The Origin of the Earth 
By Thomas C. Chamberlin 
A new chapter in “‘The Story of the Birth 
of the Earth.” 
xii+ 272 pages, 8vo, cloth; $1.75, postpaid 
$1.90. 
One of ‘‘The University of Chicago 
Science Series’’ 
The University of Chicago Press 
Chicago - - _ Illinois 
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THE UNIVERSITY OF CHICAGO PRESS 
CHICAGO, ILLINOIS 
subject. 
"of North America 
By CHARLES C. COLBY 
Assistant Professor of Geography, the University of Chicago 
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. 
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, era 
and United States government publications. 
governed by the concept that there is a direct relation hetween 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 i 
8vo0, cloth; 410 pages, $4.00, postpaid $4.15 
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