First Impression . . . October, 1923
Second " . . . November, 1923
Third " . . . November, 1923
Fourth " . . . November, 1923
Fifth " . . . January, 1924
Sixth " . . . September, 1924
Seventh " . . . April, 1925
Eighth " . . . January, 1926
Ninth " . . . May, 1928
Tenth " . . . April, 1929
Eleventh " . . . April, 1933
Twelfth " . . . January, 1936
Published in Penguin Books . 1940
Made and Printed in Great Britain for Penguin Books Limited, by Richard Clay and Company Ltd., Bungay, Suffolk.