PRESERVATIVES AND DISINFECTANTS 3$ 



sealed, no destructive organisms can get into it, and it 

 will keep for a year or more. Mold grows little seeds 

 called spores, and yeast and bacteria can form a protective 

 covering over the tiny body cell. It may take an hour 

 or more of boiling to kill these, and if any of them are on 

 the food to be canned they will not be killed by the few 



INSIDE OF PASTEURIZING APPARATUS FOR MILK 



The milk is heated by running steam through the coil. After thirty 

 minutes the milk is cooled by causing ice water to flow through the coil. 



minutes of boiling. They will start to grow in the 

 sealed can or jar and cause the food to spoil and sometimes 

 burst the can open. 



When wounds or sores are full of dangerous disease 

 germs, physicians kill them by applying a very hot 

 piece of metal ^a tool made for the purpose. A strong 



