Penguin Books Ltd, Harmondsworth, Middlesex
U.S.A.: Penguin Books Inc, 3300 Clipper Mill Road, Baltimore 11, Md
Canada: Penguin Books (Canada) Ltd, 47 Green Street, Saint Lambert, Montreal, P.Q.
Australia: Penguin Books Pty Ltd, 762 Whitehorse Road, Mitcham, Victoria
South Africa: Penguin Books (S.A.) Pty Ltd, Gibraltar House,
Regents Road, Sea Point, Cape Town
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First published 1950
Reprinted 1951
Revised and reprinted 1953
Reprinted 1955
Made and printed in Great Britain by The Whitefriars Press Ltd London and Tonbridge