COPYRIGHT, 1946, BY 

 D. VAN NOSTRAND COMPANY, INC. 



ALL RIGHTS RESERVED 



This book or any parts thereof, may not be reproduced 

 in any form without permission in writing from the 

 author and the publisher, except by a reviewer, who 

 may quote brief passages in a review to be printed in 

 a magazine or newspaper. 



PRINTED IN THE UNITED STATES OF AMERICA 



