Copyright 1941 



COLUMBIA UNIVERSITY PRESS, NEW YORK 



Foreign agents; Oxford University Press, Humphrey Milford, Amen 



House, London, E.C. 4, England, and B. I. Building, Nicol Road, 



Bombay, India; Maruzen Company, Ltd., 6 Nihonbashi, 



Tori-Nichome, Tokyo, Japan 



Manufactured in the United States of America 



