CAMBRIDGE UNIVERSITY PRESS Cambridge,New York,Melbourne,Madrid,Cape Town,Singapore,Sao Paulo Cambridge University Press The Edinburgh Building,Cambridge CB2 2RU,UK Published in the United States of America by Cambridge University Press,New York www.cambridge.org Information on this title:www.cambridge.org/9780521608640 C Cambridge University Press 2007 This publication is in copyright.Subject to statutory exception and to the provisions of relevant collective licensing agreements, no reproduction of any part may take place without the written permission of Cambridge University Press. First published 2007 Printed in the United Kingdom at the University Press,Cambridge A catalogue record for this publication is available from the British Library ISBN-13 978-0-521-84627-I hardback ISBN-I3 978-0-521-60864-o paperback Cambridge University Press has no responsibility for the persistence or accuracy of URLs for external or third-party internet websites referred to in this publication, and does not guarantee that any content on such websites is,or will remain,accurate or appropriate.CAMBRIDGE UNIVERSITY PRESS Cambridge, New York, Melbourne, Madrid, Cape Town, Singapore, Sa˜o Paulo Cambridge University Press The Edinburgh Building, Cambridge CB2 2RU, UK Published in the United States of America by Cambridge University Press, New York www.cambridge.org Information on this title: www.cambridge.org/9780521608640 # Cambridge University Press 2007 This publication is in copyright. Subject to statutory exception and to the provisions of relevant collective licensing agreements, no reproduction of any part may take place without the written permission of Cambridge University Press. First published 2007 Printed in the United Kingdom at the University Press, Cambridge A catalogue record for this publication is available from the British Library ISBN-13 978-0-521-84627-1 hardback ISBN-13 978-0-521-60864-0 paperback Cambridge University Press has no responsibility for the persistence or accuracy of URLs for external or third-party internet websites referred to in this publication, and does not guarantee that any content on such websites is, or will remain, accurate or appropriate