COPYRIGHT, 1950, BY W. B. SAUNDERS COMPANY 

 COPYRIGHT UNDER THE INTERNATIONAL COPYRIGHT UNION 



All rights reserved. This hook is protected hy copyrioht. No part of 

 it may he duplicated or reproduced in any manner without written 

 permission from the puhlisher. Made in the United States of 

 America at the Press of W. B. Satmders Company, Philadelphia. 



