Copyright, 1931, by the 



McGraw-Hill Book Company, Inc. 



All rights reserved. This book, or parts thereof, 



may not be reproduced in any form without 



permission of the publishers. 



FIRST EDITION 



Published by 



WHITTLESEY HOUSE 



Trade Division of the 



McGraw-Hill Book Company, Inc. 



370 seventh avenue, new york 



Printed in the United States of America by 

 The Maple Press Company, York, Pa. 



