TREASURY DEPARTMENT. 
Public Health and Marine-Hospital Service of the United States. 
Walter Wyman, Surgeon-General. 
✓ 
HYGIENIC LABORATORY-BULLETIN No. 28. 
XI. J. ROSENAU, Director. 
August, 1906. 
A STATISTICAL STUDY OF THE PREVALENCE 
OF INTESTINAL WORMS IN MAN. 
CII. WARDELL STILES 
AND 
PHILIP 3 E. GARRISON. 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
I906. 
