218 PRINCIPLES AND PRACTICE OF MILK HYGIENE 
the hot water through the outer tube in the opposite 
direction. The end connections are removable to facili- 
tate cleaning. Fig. 26 shows a “starter can” adapted 
to pasteurize small quantities of milk. It may also be 
used as a cooler. 
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Fig. 26.—(B. A. I. Cire. 184). 
In the “flash” method of pasteurization the milk 
passes from the pasteurizer over a cooler. Sometimes 
a regenerative cooler is used in which the milk to be 
pasteurized flows down one side of a corrugated sheet 
of metal and the milk coming from the pasteurizer flows 
down the other side, the cold milk thus absorbing some 
