SOLE DISTRIBUTORS FOR THE UNITED STATES OF NORTH AMERICA! 



D. VAN NOSTRAND COMPANY, INC. 



120 Alexander Street, Princeton, N.J. (Principal office) 

 24 West 40th Street, New York 18, N.Y. 



SOLE DISTRIBUTORS FOR CANADA! 



D. VAN NOSTRAND COMPANY (CANADA), LTD. 



25 Hollinger Road, Toronto 16 



SOLE DISTRIBUTORS FOR THE BRITISH COMMONWEALTH EXCLUDING CANADA; 



D. VAN NOSTRAND COMPANY, LTD. 

 358 Kensington High Street, London, W. 14 



Library of Congress Catalog Card Number: 60-15524 



With 41 figures 



All rights reserved. This book or any part thereof may not be reproduced 



in any form (including photostatic or microfilm form) without 



written permission from the publishers 



PRINTED IN THE NETHERLANDS BY 

 N.V. DRUKKERIJ G. J. THIEME, NIJMEGEN 



