Copyright. 1916, by W. B. Saunders Company. Reprinted February, 1917, 



November, 1917, April, 1918, and October, 1918. Revised, reprinted, 



and recopyrighted February, 1919. 



Copyright, 1919, by W. B. Saunders Company. 



PRINTED IN AMERICA 



PRESS OF 



W. B, SAUNDERS COMPANY 

 PHILADELPHIA 



