The paper used in this publication meets the minimum requirements of the American National Standard for Information Sciences—Permanence of Paper for Printed Library Materials, ANSI Z39.48-1992.The University of Chicago Press, Chicago 60637
The University of Chicago Press, Ltd., London
Copyright in the International Copyright Union
All rights reserved. Originally published 1952
Paperback edition 1976
Printed in the United States of America
04 03 02 01 00 99 6 5 4 3
ISBN: 0-226-32094-4 (paperback)
ISBN-13: 978-0-226-32130-1 (e-book)
The paper used in this publication meets the minimum requirements of the American National Standard for Information Sciences—Permanence of Paper for Printed Library Materials, ANSI Z39.48-1992.