PASTEURIZATION 



219 



of the heat from the hot milk before the latter reaches 

 the cooler. ( See Fig. 27. ) In the "holder" method, the 

 milk is run from the pasteurizer or heater into the holder 

 or retarder to be held at a certain temperature for a 

 certain period of time. In the holder, the milk stops 



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Fio. 27. Regenerative Cooler. (B. A. I. Circ. 184). 



flowing and is actually held for the required time. On 

 the other hand, in the retarder the flow continues, but is 

 slowed or retarded sufficiently to hold the milk for the 

 required period. The retarder is not as reliable as the 

 holder. A simple and cheap holding tank is shown in 



