CLEAN MILK 



S. D. BELCHER, M.D. 



RESEARCH WORKER IN THE ROCKEFELLER INSTITUTE 



FOR MEDICAL RESEARCH, ATTACHED TO THE 



RESEARCH LABORATORY OF THE DE- 



PARTMENT OF HEALTH OF THE 



CITY OF NEW YORK 



With an Introduction by 

 WILLIAM HALLOCK PARK, M.D. 



PROFESSOR OF BACTERIOLOGY AND HYGIENE IN THE 



UNIVERSITY AND BELLEVUE HOSPITAL MEDICAL 



COLLEGE AND DIRECTOR OF THE RESEARCH 



LABORATORY OF THE DEPARTMENT OF 



HEALTH OF THE CITY OF NEW YORK 



New York 



The Hardy Publishing Company 

 1903 



