Penguin Books Ltd, Harmondsworth, Middlesex
U.S.A.: Penguin Books Inc, 3300 Clipper Mill Road, Baltimore 11, Md
Australia: Penguin Books Pty Ltd, 762 Whitehorse Road,
Mitcham, Victoria
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First published in Penguin Books 1949
Reprinted 1950
New edition, revised and enlarged, 1952
Reprinted 1954, 1956, 1957
Reprinted with revisions, 1958
Made and printed in Great Britain by Hunt, Barnard & Co,Ltd Aylesbury