The Sleepwalkers A History of Man's Changing Vision of the Universe

Penguin Books Ltd, Harmondsworth, Middlesex, England Penguin Books Australia Ltd, Ringwood, Victoria, Australia

First published by Hutchinson 1959 Published in Penguin Books 1964 Reissued in Pelican Books 1968

Copyright © Arthur Koestler, 1959

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

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 purchase