Pelicans ISBN 0 14 02.1715 0 - Po: Beyond Yes and No

Penguin Books Ltd, Harmondsworth, Middlesex, England Penguin Books, 625 Madison Avenue, New York, New York 10022, U.S.A. Penguin Books Australia Ltd, Ringwood, Victoria, Australia Penguin Books Canada Ltd, 2801 John Street, Markham, Ontario, Canada L3R 1B4 Penguin Books (N.Z.) Ltd, 182-190 Wairau Road, Auckland 10, New Zealand

First published by Simon & Schuster, New York 1972 This revised edition published in Pelican Books 1973 Reprinted 1974, 1975, 1976, 1977, 1978

Copyright © European Services Ltd, 1972 All rights reserved

Set, printed and bound in Great Britain by Hazell Watson & Viney Ltd, Aylesbury, Bucks Set in Linotype Juliana

Except in the United States of America, this book is sold subject to the condition that it shall not, by way of trade or otherwise, be lent, re-sold, hired out, or otherwise circulated without the publisher’s prior consent in any form of binding or cover other than that in which it is published and without a similar condition including this condition being imposed on the subsequent purchaser