132 DISINFECTION— STERILIZ A TION— DISINFECTANTS 



material is rapidly cooled. It is certain that all pathogenic 

 microorganisms, except the very few spore formers in that 



Fig. 90. — A pasteurizer for cream to be used in making ice-cream. 



stage, are killed by proper pasteurization. The process is 

 largely employed in the fermentation and dairyf industries. 



