Penguin Books Ltd, Harmondsworth, Middlesex, England
Penguin Books Pty Ltd, Ringwood, Victoria, Australia
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First published in the U.S.A. by McGraw-Hill 1950
First published in Great Britain by
William Heinemann Ltd 1950
Published in Penguin books 1966
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Copyright © Yale University, 1950
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Made and printed in Great Britain
by Cox & Wyman Ltd,
London, Reading and Fakenham
Set in Monotype Garamond
This book is sold subject to the condition that it shall not, by way of trade or otherwise, be lent, re-sold, hired out, or otherwise circulated without the publisher's prior consent in any form of binding or cover other than that in which it is published and without a similar condition including this condition being imposed on the subsequent purchaser