Issued September 25, 1912. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ANIMAL INDUSTRY. BULLETIN 153. 



A. D. MELVIN, CHIEF OF BUREAU. 



2 =^| HE ACTION OF ANTHELMINTICS ON PARASITES 

 LOCATED OUTSIDE OF THE 

 ALIMENTARY CANAL. 



BY 



BRAYTON HOWARD RANSOM, 



Chief of the Zoological Division^ 

 AND 



MAURICE C. HALL, 



Assistant Zoologist, Zoological Division. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 

 1912. 



