PRINCIPLES AND PRACTICE 
OF MILK HYGIENE 
BY 
LOUIS A. KLEIN, V.M.D. 
PROFESSOR OF PHARMACOLOGY AND VETERINARY HYGIENE IN THE SCHOOL OF VETBRINARY 
MEDICINE AT THE UNIVERSITY OF PENNSYLVANIA, AND DEAN OF THD FACULTY 
41 ILLUSTRATIONS IN THE TEXT 
PHILADELPHIA AND LONDON 
J. B. LIPPINCOTT COMPANY 
i 
