PART I. 



MILK. 



" Sauberes Euter, reine Hose und Hand 

 Bringen zur Ehre den Melkerstand." 



Swiss Proverb. 



CHAPTER I. 

 MILK AS DRAWN FROM THE UDDER 



the milk is drawn from the udder of a healthy 

 cow it is germ-free or sterile. Lister, Meissner, Duclaux, 

 and other scientists have shown that such milk will re- 

 main unchanged for all time without any preservatives 

 being added, if it is only carefully protected from all bac- 

 terial infection. The original sterility of normal milk is 

 due to the fact that the bacteria cannot gain access to the 

 milk-glands from without as long as the udder is not 

 injured in any way, and that the udder can only be in- 

 fected by bacteria from within, from the different internal 

 parts of the animal body, when these parts themselves are 

 infected with bacteria, i.e., are not in their normal, healthy 

 condition. 



It is a comparatively easy bacteriological experiment to 



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