CARE OF FOOD IN THE HOME 



499 



saliva, that when dishes are hand washed and not rinsed all the 

 bacteria are not removed. Some of the bacteria are not destroyed 

 unless boiling hot water is used. At the time of the influenza 

 epidemic during the World War an investigation was made of 

 66,000 men, half of whom ate 



cases of influenza 

 and. dish"washing 



£1 per 1000 



-when dishes 

 are v/asYiedi 

 in boiling 

 hot -water* 



252 per 1000 



-when dishes 

 cere, not^ 



^cts-teed 



Explain, from text, what this diagram means. 



from plates which were washed 



in boiling water, the other half 



from mess plates which were 



washed carelessly by the men. 



The influenza rate was 51 per 



1000 among the men who ate 



from properly washed dishes, 



and 252 per 1000 among the 



men who ate from mess plates. These facts show plainly the 



need of proper washing of dishes. 



Milk at home should receive the best of care. It should be kept 

 on ice and in covered bottles, because it readily takes up the 

 odors of other foods. If we are not certain of its purity or keeping 

 qualities, it should be pasteurized at home. Why? Experiments 

 made with good fresh milk, which at the first observation contained 

 about 30,000 bacteria per cubic centimeter, showed that twenty- 

 four hours later, if kept at the temperature of the average ice box 

 (below 50° Fahrenheit), there were about the same number of 

 bacteria present; while some of the same milk exposed to a 

 temperature of 68° Fahrenheit showed 500,000,000 bacteria to the 

 cubic centimeter. 



Demonstration 8. To determine the bacterial content of milk of 

 various grades and from different sources. 



Put a couple of drops of certified, pasteurized, raw, etc., milk, in 

 separate Petri dishes containing sterile agar. Cover the dishes and 

 put them in a warm dark place (about 90° F.) for 24 hours. Which 

 dish shows the greatest number of colonies? The greatest number of 

 different colonies? Which is the best kind of milk to use ? Why? 



Demonstration 9. To determine the bacterial content of distilled 

 water, rain water, tap water, dilute sewage. 



Put several drops of the various kinds of water on dishes containing 

 sterile agar. Cover the dishes and put them in a warm dark place for 

 24 hours. Which dish contains the greatest number of colonies? The 

 greatest number of different colonies? Which is the best water to use for 

 drinking purposes? For cooking? For laundry? Why? 



