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© J o h n Wright & Sons Ltd., 1976 All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the Copyright holder. First edition, 1939 Reprinted, i960 Second edition, 1966 Reprinted, 1970 Third edition, 1976 Reprinted, 1982 Greek edition, 1961 French edition, 1969 Spanish edition, 1974 German edition, 1974 ISBN 0 7236 0388 X Printed in Great Britain by J o h n Wright & Sons (Printing) Ltd., at The Stonebridge Press, Bristol