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Copyright, 1913, by W. B. Saunders Company. Reprinted 



June, 1914. Revised, reprinted, and recopyrighted 



October, 1916. Reprinted January, 1918, and July, 



1918. Revised, reprinted, and recopyrighted 



August, 1919 



Copyright, 1919, by W. B. Saunders Company 



Reprinted May, 1920 



PRINTED IN AMERICA 



PRESS OF 

 B. SAUNDERS COMPANY 

 PHILADELPHIA 



