Author's Preface. 



special chapter on the preparation of infants' milk, or certified 

 milk, has been omitted, since the sanitarian can not make any 

 distinction in his judgment of milk as food, but must remember 

 that milk which is consumed by children of the masses should also 

 come up to the requirements established for any food product 

 from a hygienic standpoint. 



The chemical and physical properties of milk are only dis- 

 cussed to an extent deemed necessary to instruct the veterinary 

 experts in court cases in judging physiological, pathological and 

 external influences. Since the chemical examination of milk should 

 be placed in the hands of the food chemist, I have eliminated the 

 analytical examination of milk and the examination for preserva- 

 tives. For this information I would recommend the numerous 

 publications which have appeared during recent times, as for in- 

 stance, the works of Grimmer and Sommerfeld, Teichert, Utz and 

 Barthel. Only those methods have been described which may be 

 undertaken by the veterinarian and which are sufficient for a 

 thorough preliminary test of milk for adulterations. 



The illustrations are taken partly from the known works of 

 my previous teacher, Professor Dr. med. Th. Kitt (Pathological 

 Anatomy) and from Friedberger and Frohner's Methods of Clini- 

 cal Examination ; some were drawn by myself. The illustrations 

 of apparatuses have been avoided, as they appear in all commercial 

 catalogues. 



In dividing the subject into individual chapters repetitions, 

 of course, could not be avoided. 



With the preparation of this small work I desire to show to 

 my colleagues the road which they must follow in order to cooper- 

 ate from a milk inspection standpoint in accordance with the call 

 made upon their profession. 



A difficult point of milk hygiene lies in the changing conditions 

 of production and not in the control of milk consumption or in the 

 supervision of milk transportation. 



W. ERNST. 



Munich, January, 1913. 



