26 LABORATORY LESSONS IN GENERAL SCIENCE 



Cleanliness and wholesomeness should characterize every 

 part in the process of food preparation. Because it is im- 

 possible for consumers to know the conditions under which 

 the foodstuffs sold in market have been prepared, and 

 whether these foodstuffs are of the quality and weight 

 represented to purchasers, there has arisen need of Pure 

 Food Laws and of provisions for their enforcement. Why 

 is the need for sanitary precautions in handling food supplies 

 imperative ? What conditions must be observed in the care 

 of food in our homes? 



2. Explain why sleeping in small closed rooms in winter, 

 or working in overcrowded rooms not properly ventilated, 

 is insanitary, aside from the danger of oxygen starvation. 



3. Why is it that open sewers and rotting piles of garbage 

 and stable refuse are insanitary? What is the common 

 means of protection of our homes from the flies that breed 

 in such places? What is a better course? Why is there a 

 menace to health in the exposure of foodstuffs to dust blown 

 about on city streets? What precautions should be taken 

 against infection with malarial germs? Why are not all 

 mosquito bites equally dangerous? 



4. How may ice become a carrier of infection? What 

 care should be exercised (a) where food is kept in refriger- 

 ators ; (b) in the use of ice for cold drinks ? Why is it that 

 food does not spoil so soon when kept cold in a refrigerator ? 



5. Why is there greater need of attention to sanitary 

 measures now than formerly? What is the penalty of 

 carelessness and ignorance in these matters ? Are cases of 

 sickness made more dangerous because of a better knowledge 

 of the nature of infection? What on the other hand is 



