Penguin Books Ltd, Harmondsworth, Middlesex
Australia: Penguin Books Pty Ltd, 762 Whitehorse Road,
Mitcham, Victoria
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First published by Blackwell 1950
Revised edition published 1960
Published in Pelican Books 1963
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Copyright © Basil Blackwell & Mott Ltd, 1960
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Made and printed in Great Britain
by Hazell Watson & Viney Ltd
Aylesbury and Slough
Set in Linotype Baskerville
This book is sold subject to the condition that it shall not, by way of trade, be lent, re-sold, hired out, or otherwise disposed of without the publisher’s consent, in any form of binding or cover other than that in which it is published