THE PASTEURIZATION OF MILK 



was also set in ice for four hours and showed 8 per 

 cent, of cream upon the gauge. 



A fourth sample was taken from a second tank 

 in which the milk was heated to a temperature of 

 146 and held thereat for exactly thirty minutes. 

 This milk showed 15 per cent, of cream upon the 

 gauge. 



The method of handling the milk at this plant 

 should be noted. Milk was poured from the cans 

 into a dumping tank on the ground floor. It was 

 then pumped to a small tank upon the third floor 

 of the building, thence flowed through a centrifugal 

 clarifier, such as shown in Fig. 32, and then flowed 

 directly into the pasteurizing tanks. 



SECOND TEST. A test was also made in another 

 milk plant in which the same form of pasteurizing 

 apparatus was installed. In this plant, the milk 

 was pumped from the receiving vat on the gound 

 floor into a tank upon the second floor, from which 

 the milk flowed through a clarifier and was then 

 discharged into a mixing vat, from which it flowed 

 into the various pasteurizing tanks. The opera- 

 tion of this plant was similar to that in the plant 

 previously described, except that, in the first in- 

 stance, the water which was forced through the 



