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Copyright, 1923
By Yale University Press
Printed in the United States of America
First published, February, 1923
Second printing, March, 1938
Third printing, December, 1943
Fourth printing, March, 1946
Fifth printing, September, 1950
Sixth printing, January, 1954
Seventh printing, February, 1956
Eighth printing, November, 1957
All rights reserved to the editorial contributions to this edition, which may not be reproduced, in whole or in part, in any form, except by written permission from the publishers.
