104 



ELEMENTS OF GENERAL SCIENCE 



TYPHOID FEVER ix THE UNITED STATES ARMY 1 



Cases Deaths 



210 12 



124 7 



Year 

 1906 

 1907 



1908 

 1909 



130 

 173 



TYPHOID FEVER ix THE UXITED STATES NAVY 



1909 

 1910 

 1911 



189 

 193 



000 



AXTI-TYPHOID VACCINATION MADE COMPULSORY 

 ix THE ARMY AXD NAVY 



1912 

 1913 

 1914 

 1915 



The sanitary drainage canal, opened in Chicago in 1900, 

 helped to reduce deaths from typhoid fever. Purer water and 

 better milk, as well as better sewage disposal, have helped. 

 The following table is significant : 



TYPHOID DEATH KATE IN CHICAGO AFTER THE OPENING OK 

 THE DRAINAGE CANAL 



1 W. W. Keen, in Science (New Series), Vol. XLVII (1918), p. 177. 



