Penguin Books Ltd, Harmondsworth, Middlesex
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 1939
Revised edition published in Penguin Books 1955
Made and printed in Great Britain by Butler and Tanner Ltd, Frome and London