BACTERIAL DISEASES 



441 



In order to keep bacteria from spoiling meat, borax is 

 sometimes used. Formalin is sometimes put into milk 

 to keep it from souring, and benzoate of soda into catsups 



Courtesy of Beech-Nut Packing Co. 

 STERILIZING CATSUP AND CHILI SAUCE 



The metal baskets filled with bottles of chili sauce and catsup are lowered 

 into the sterilizing tanks, which are constructed on the principle of the 

 pressure cooker (page 126). Notice the abundant lighting and scrupu- 

 lous cleanliness of the room. 



for the same reason. These three substances act as preserv- 

 atives, but they also make the food unwholesome and so we 

 have pure food laws prohibiting the use of such preserva- 

 tives for foods. 



Bacterial Diseases. Out of the fifteen hundred or more 

 kinds of bacteria that are known, only about seventy may 

 grow in our bodies and make us ill. Most of the others are 



