ON MILK AND MILK-TESTING I7 



How can buttermilk be prepared from skimmed 

 milk? 

 Skimmed milk is heated to 165° F. for ten 

 minutes and then cooled to 70° F., when about 5 per 

 cent of a good culture of lactic acid is added. The 

 milk should be softly coagulated in 12 hours. It is 

 then churned for five minutes and the result is a 

 fine quality of buttermilk. 



How are the fancy acid milk drinks prepared? 



By pasteurizing skimmed milk, then cooling and 

 adding cultures of some acid-producing bacteria 

 or yeasts. The milk is securely bottled to prevent 

 outside contamination. 



What is market milk? 



Milk that is produced and marketed solely for its 

 use as milk. 



How is milk marketed? 



Milk in its raw state is marketed in one of two 

 ways, (i) In bulk form. (2) In bottles or sealed 

 vessels. 



Milk is sold under many descriptive and yet de- 

 ceiving names, such as aerated, clarified, modified, 

 pasteurized, standardized, etc. These words usually 

 indicate some special treatment given to milk by 

 the producer or dealer. 



What is sanitary milk? 



Milk that is produced under sanitary conditions. 



What is aerated milk? 



Milk that has been exposed to the air for the pur- 

 pose of cooling it or allowing animal odors to pass 



