TREASURY DEPARTMENT. 
Public Health and Marine-Hospital Service of the United States. 
Walter Wyman, Surgeon-General. 
HYGIENIC LABORATORY.— BULLETIN No. 31. 
XL. J. KOSIW I I, Director, 
August, 1906. 
VARIATIONS IN THE PEROXIDASE ACTIVITY OF THE 
BLOOD IN HEALTH AND DISEASE. 
JOSEPH II. KASTLE 
AND 
HAROLD L. A MOSS. 
WASHINGTON: 
GOVERNMENT PRINTING OFFICE. 
1906. 
