Copyright © 2004 by The Hebrew University of Jerusalem Published by Princeton University Press, 41 William Street, Princeton, New Jersey 08540 In the United Kingdom: Princeton University Press, 3 Market Place, Woodstock, Oxfordshire OX20 1SY pup.princeton.edu All Rights Reserved ISBN: 0-691-12124-9 Library of Congress catalog card number: 87-160800 This book has been composed in Times Roman. The publisher would like to acknowledge the Einstein Papers Project for providing the camera-ready copy from which this book was printed. Princeton University Press books are printed on acid-free paper and meet the guidelines for permanence and durability of the Committee on Production Guidelines for Book Longevity of the Council on Library Resources. Printed in the United States of America 1 3 5 7 9 10 8 6 4 2