First published in July 1954
Second Impression December 1954
Third Impression January 1955
Fourth Impression November 1955
Fifth Impression March 1956
Sixth Impression December 1956
Seventh Impression October 1957
Eighth Impression 1959
Ninth Impression 1960
Tenth Impression 1961
Eleventh Impression 1961
Twelfth Impression 1962
Thirteen Impression 1963

This book is copyright under the Berne Convention. Apart from any fair dealing for the purposes of private study, research, criticism or review, as permitted under the Copyright Act 1956, no portion may be reproduced by any process without written permission. Enquiry should be made to the publisher.

Printed in Great Britain
in 11 on 12 point Imprint type
by Jarrold & Sons Ltd,
Norwich