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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 1965 Copyright © S. H. Hollingdale and G. C. Tootill, 1965

Made and printed in Great Britain by Hazell Watson & Viney Ltd, Aylesbury, Bucks

Set in Monotype Times

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