THE PASTEURIZATION OF MILK 



of the absolute or the continuous type, careful 

 sterilization should be practised, not only directly 

 after the apparatus is washed each day, but also 

 immediately before its use on the following day. 

 The reason for this is due to the fact that any 

 organic matter which may remain in the apparatus 

 after washing may contain spores of bacteria 

 which are not readily killed by the heating to 

 which the apparatus is usually subjected. These 

 spores may develop into active bacteria during the 

 time that the apparatus remains idle. Especially 

 would this be true if, as usually occurs, consid- 

 erable moisture is allowed to remain in the machine. 

 For this reason the holder should be thoroughly 

 sterilized before use each day. It may here be 

 noted that there is even a greater necessity for 

 sterilizing the cooler, pipes, bottling machine, etc., 

 with which the pasteurized milk comes in contact 

 after leaving the holder. Any recontamination at 

 these points is not afterward corrected and may 

 be a source of danger. 



It should here be noted that a feature which 

 has been introduced into some milk plants con- 

 sists in a brief superheating of the milk after it 

 leaves the holder. This is accomplished by allow- 

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