PART II. 



MILK AND ITS PRODUCTS. 



CHAPTER XVII. 



MILK. 



Milk, in a broad sense, may be denned as the normal 

 secretion of the mammary glands of animals that suckle 

 their young. It is the only food found in Nature con- 

 taining all the elements necessary to sustain life. More- 

 over it contains these elements in the proper propor- 

 tions and in easily digestible and assimilable form. 



Microscopic appearance of milk showing relative size of fat globules and 

 bacteria. Russell's Pairy Bacteriology. 



Physical Properties. Milk is a whitish opaque fluid 

 possessing a sweetish taste and a faint odor suggestive 

 of cows' breath. It has an amphioteric reaction, that is, 



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