1 8 QUESTIONS AND ANSWERS 



off. Many forms of aerating devices are used for 

 this purpose, but aeration has many disadvantages 

 and practically no advantages in the production of 

 clean, sweet milk. 



What is clarified milk? 



Milk that has been run through a separator or 

 centrifugal machine for the purpose of removing 

 insoluble dirt. This process has few beneficial ef- 

 fects on milk. It is much better to keep dirt out 

 of milk in the first place than try to remedy the evil 

 later. 



What is modified milk? 



Milk that is modified for some special purpose, 

 such as infant feeding, by the addition of such 

 agents as lime water and barley water, or by the 

 removal of part of the fat or casein. 



What is electrified milk? 



Milk that has been treated by a current of elec- 

 tricity for the purpose of destroying bacteria. 



What is pasteurized milk? 



Milk that has been heated to a high temperature 

 (at least 140° F.) for a period of time for the pur- 

 pose of destroying bacteria. The milk is usually 

 cooled immediately to at least 50° F. in order to 

 increase its keeping power. A great deal of the 

 milk consumed in the larger cities is treated in this 

 manner, as it is a necessary way for the present 

 at least, of remedying, in part, defects in milk 

 caused by carelessness. 



