Penguin Books Ltd, Harmondsworth, Middlesex, England
Penguin Books Pty Ltd, Ringwood, Victoria, Australia
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First published in the U.S.A. 1961
Published in Great Britain by Bell 1963
Published in Pelican Books 1966
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Copyright © Martin Gardner, 1961
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Material previously in Scientific American
is copyright 1958, 1959, 1960 by Scientific American, Inc.
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Made and printed in Great Britain
by Cox and Wyman Ltd,
London, Reading and Fakenham
Set in Monotype Bembo
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