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P E R G A M O N P R E S S L T D . 4 - 5 Fitzroy Square, London, W . l . P E R G A M O N P R E S S I N C . 122 East 55th Street, N e w York, 22. P.O. Box 47715, Los Angeles, California. P E R G A M O N P R E S S S A R L 24 Rue des Ecoles, Paris, Ve. First published 1959 Copyright © 1959 Pergamon Press Ltd. Library of Congress Card No . 58-12672 Printed in England by Pergamon Printing & Art Services L t d .