Copyright, 1905, by W. B. Saunders and Company. Reprinted February, 1906, September, 

 1906, and January, 1907. Revised, reprinted, and recopyrigiited August, 1907. Reprinted 

 January, 1908, and October, 1908. Revised, reprinted, and recopyrighted August, 

 1909. Reprinted January, 1910, and July, 1910. Revised, reprinted, and recopy- 

 righted August, 1911. Reprinted January, 1912, and October, 1912. Revised, re- 

 printed, and recopyrighted September, 1913. Reprinted, August, 1914. Re- 

 vised, reprinted, and recopyrighted September, 1915. Reprinted March, 

 1916, January, 1917, May, 1917, and March, 1918. Revised, re- 

 printed, and recopyrighted September, 1918. Reprinted March, 

 1919, September 1919, January, 1920, and June, 1920. Re- 

 vised, reprinted, and recopyrighted September, 1921. 



Copyright, 1921, by W. B. Saunders Company 



Registered at Stationers' Hall, London, England 



Reprinted July, ig22 



Reprinted October, 1922 



PRESS OF 

 JNDERS COK 

 lUAOEUPHIA 



