Copyright, 1954, by W. B. Saunders Company 



copyright under the international copyright union 



All rights reserved. This hook is protected by copyright. No part of 

 it may be reproduced in any manner without written permission from 

 the publisher, except for any purpose of the United States Government. 



Made in the United Slates of America. 



Library of Congress Catalog Card Number: 54-12407 



