Penguin Books Ltd, Harmondsworth, Middlesex
Australia: Penguin Books Pty Ltd, 762 Whitehorse Road,
Mitcham, Victoria
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First published by Faber and Faber 1959
Published in Penguin Books 1963
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Copyright © James Blish, 1958
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Made and printed in Great Britain
by Richard Clay & Company, Ltd,
Bungay, Suffolk
Set in Monotype Imprint
The beginning of this novel first appeared in abridged form as ‘A Case of Conscience’ in IF Worlds of Science Fiction, in which form it is copyright 1953 by Quinn Publishing Co., Inc.
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