CHARLES C THOMAS ■ PUBLISHER 



Bannerstone House 



301-327 East Lawrence Avenue, Springfield, Illinois, U.S.A. 



Published simultaneously in the British Commonwealth of Nations by 



BLACKWELL SCIENTIFIC PUBLICATIONS, LTD., OXFORD, ENGLAND 



Published simultaneously in Canada by 



THE RVERSON PRESS, TORONTO 



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© 1960, by CHARLES C THOMAS • PUBLISHER 

 Library of Congress Catalog Card Number: 59-8491 



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Printed in the United States of America 



