D. VAN NOSTRAND COMPANY, INC. 



120 Alexander St., Princeton, New Jersey {Principal office) 

 24 West 40 Street, New York 18, New York 



D. Van Nostrand Company, Ltd, 

 358, Kensington High Street, London, W.14, England 



D. Van Nostrand Company (Canada), Ltd. 

 25 Hollinger Road, Toronto 16, Canada 



Copyright © 1961, by 

 D. VAN NOSTRAND COMPANY, Inc. 



Published simultaneously in Canada by 

 D. Van Nostrand Company (Canada), Ltd. 



Library of Congress Catalogue Card No. 61-8542 



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PRINTED IN THE UNITED STATES OF AMERICA 



