BACTERIOLOGY OF MILK 



133 



another fifteen minutes. After that the milk is kept on 

 ice until used. 



Freeman's pasteurizer consists of a pail with a tight- 

 fitting cover and a removable rack, holding a number of 



Fig. 41. Arnold's apparatus for sterilizing milk (Ashton). 



eylindric metal cups, which receive the milk bottles. 

 The pail is filled with water to a groove about halfway 



Fig. 42. Apparatus for pasteurizing milk (Ashton). 



from the top and the water is brought to the boiling- 

 point. The milk bottles are then placed into the metal 

 cups and are in these surrounded by water, which 



