Penguin Books Ltd, Harmondsworth, Middlesex
U.S.A.: Penguin Books Inc, 3300 Clipper Mill Road, Baltimore 11, Md
Australia: Penguin Books Pty Ltd, 762 Whitehorse Road,
Mitcham, Victoria
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First published by the Edinburgh University Press 1959
Published in Penguin Books 1962
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Copyright © Edinburgh University Press, 1959
Made and printed in Great Britain by Hazell Watson & Viney Ltd Aylesbury and Slough
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