Penguin Books Ltd, Harmondsworth, Middlesex, England Penguin Books Inc, 3300 Clipper Mill Road, Baltimore 11, Md, U.S.A. Penguin Books Pty Ltd, Ringwood, Victoria, Australia
First published by Eyre & Spottiswoode 1963 Revised edition published in Penguin Books 1964
Made and printed in Great Britain by Butler & Tanner Ltd, Frome and London Set in Monotype Imprint
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