Issued September 21, 1912. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF CHEMISTRY— BULLETIN No. 156. 



R. E. DOOLITTLE, Acting Chief of Bureau. 



SEWAGE-POLLUTED OYSTERS AS A CAUSE 

 OF TYPHOID AND OTHER GASTRO- 

 INTESTINAL DISTURBANCES. 



A STUDY OF AN EPIDEMIC AND 

 OF CERTAIN INDIVIDUAL CASES. 



GEORGE W. STILES, Jr., 



Chief, Bacteriological Laboratory. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1912. 



