April 2U, 1'Jll. 



U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ANIMAL INDUSTRY. BULLETIN 135. 



A. D. MELVIN, CHIEF OK BUREAU. 



A COMPARATIVE STUDY OF METHODS OF 



EXAMINING FECES FOR EVIDENCES 



OF PARASITISM. 



BY 



MAURICE C. HALL, 



Aftxititant Zoologist, Zoological Dirixwn. 



WASHINGTON : 



GOVKRNMHNT PRINTING OI-KICE. 



1911. 



