HOUSEHOLD BACTERIOLOGY 



PART I. 



Read Carefully. Place your name and address on the first 

 sheet of the test. Use a light grade of paper, write on om. 

 side of the sheet only, and leave space between answers. 

 Use your own words, so that your instructor may know that 

 you understand the subject. Read the lesson book a num- 

 ber of times before attempting to answer the questions. 

 Answer every question fully. 



1. What are bacteria? Describe them. 



2. What other microscopic forms are found in 



dust and what are favorable conditions for the 

 growth of these dust-plants ? 



3. Where are bacteria most numerous and what is 



their chief work in the world ? 



4. In what ways are bacteria helpful to man and 



in what way do they injure him or his pos- 

 sessions ? 



5. Why should food eaten raw or unskinned be 



thoroughly cleaned ? 



6. What sanitary end is attained by cooking food? 



7. Why are oranges and bananas safer fruits than 



grapes or peaches bought from a street ven- 

 der? 



8. How can scalding apple or other sauce prevent 



its spoiling, and why scald it more than once? 



