EXERCISE V 

 PASTEURIZATION BY THE FLASH METHOD 



NOTE: This exercise should be performed in combination with 

 Exercise IV. 



1. Thoroughly scald the machine. This may best be done by 

 allowing water to pass through the machine and turning on the steam 

 at the same time. Allow this hot water to pass over the cooler and 

 so far as possible sterilize it. Use for this experiment the two cans 

 of milk, mixed as directed in Exercise IV. Pasteurize the milk at a 

 temperature of 160 F. Carefully record the pounds of milk used, 

 time required for the process, temperature of refrigerating material 

 as it enters and leaves the cooler and the temperature to which the 

 milk is cooled. 



2. Take in a sterile bottle a sample of the milk to be plated for 

 bacteria. Compare the count obtained with that of the raw milk 

 and that obtained from the milk pasteurized by the holder method. 



