D. VAN NOSTRAND COMPANY, INC.

120 Alexander St., Princeton, New Jersey

257 Fourth Avenue, New York 10, New York

25 Hollinger Rd., Toronto 16, Canada

Macmillan & Co., Ltd., St. Martin’s St., London, W.C. 2, England

_All correspondence should be addressed to the

principal office of the company at Princeton, N. J._

Copyright, ©, 1956 by

D. VAN NOSTRAND COMPANY, INC.

Published simultaneously in Canada by

D. VAN NOSTRAND COMPANY (Canada), LTD.

_All Rights Reserved_

_This book, or any parts thereof, may not be

reproduced in any form without written permission

from the author and the publishers._

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