PREFACE 



IN this book an effort has been made to present 

 systematically, in concise form, the facts and principles 

 which are of importance in the practice of milk hygiene 

 and to describe how they may be applied in the inspec- 

 tion of dairy farms and in the examination of milk. The 

 material has been obtained from various sources. Jen- 

 sen's " Milk Hygiene/' Savage's " Milk and the Public 

 Health," Conn's " Practical Dairy Bacteriology," Swith- 

 inbank and Newman's " Bacteriology of Milk," King's 

 " Ventilation," Van Slyke's " Modern Methods of Test- 

 ing Milk and Milk Products," Grimmer's " Chemie und 

 Physiologic der Milch," Rievel's " Milchkunde," Weig^ 

 mann's " Mykologie der Milch," Ernst's " Milchhygiene 

 fiir Tierarzte," Sommerfeld's " Handbuch der Milch- 

 kunde," and Barthel's " Methoden zur Untersuchung 

 von Milch und Molkereiprodukten " have been freely 

 drawn upon, while articles by numerous research workers 

 which have appeared in the various journals and official 

 reports have furnished many important facts. To all of 

 these authors and investigators due acknowledgment is 

 made. 



The book is intended primarily as a text for students 

 taking a course in milk hygiene, but it is the hope of the 

 author that it will also prove of service to dairy inspec- 

 tors, milk examiners, public health officials, dairymen, 

 milk distributers, and others interested in the production 

 of wholesome milk. 



Louis A. KLEIN 



PHILADELPHIA, PA. 



SEPTEMBER 15, 1917. 



369211 



