D. VAN NOSTRAND COMPANY, INC. 120 Alexander St., Princeton, New Jersey (Principal office) 257 Fourth Avenue, New York 10, 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 © 1951, by D. Van Nostrand Co., Inc. Published simultaneously in Canada by D. VAN NOSTRAND COMPANY (Canada), LTD. No reproduction in any form of this book, in whole or in part (except for brief quotation in critical articles or reviews), may be made without written authorization from the publishers. First Published April 1951 Reprinted May 1953 May 1957, December 1959 PRINTED IN THE UNITED STATES OF AMERICA BY LANCASTER PRESS, INC., LANCASTER, PA. -iv- |