NEW YORK: D. VAN NOSTRAND COMPANY, INC. 250 Fourth Avenue, New York 3 TORONTO: D. VAN NOSTRAND COMPANY ( Canada), Ltd. 228 Bloor Street, Toronto LONDON: MACMILLAN COMPANY, Ltd. St. Martin's Street, London, W. C. 2 Copyright, 1952, by D. Van Nostrand Company, Inc. Published simultaneously in Canada by D. Van Nostrand Company ( Canada), Ltd. Designed by Lewis F. White All Rights Reserved. This book, or any parts thereof may not be reproduced in any form without written permission from the author and the publisher. Library of Congress Catalog No. 52-6387 Printed in the United States of America -ii- |