Issued September 25, 1912. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ANIMAL INDUSTRY. BULLETIN 153. 



A. D. MELVIN, CHIEF OF BUREAU. 



THE 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. 

 191Z 



