PUBLIC HYGIENE AND SANITATION 415 



the streets, and the condition of fruit and vegetables which are exposed 

 for sale in front of stores, and on the streets of the town. 



181. In manure piles and garbage heaps look for maggots and pupa 

 cases of house flies. Call attention to the ease with which flies might be 

 exterminated if the whole community would cooperate. 



182. Notice the rain barrels about town, and see if they contain 

 " wigglers," or young mosquitoes. Find out if there is malaria in town, 

 and if so look for the breeding places of the mosquitoes that cause it and 

 plan the means for its prevention. 



REVIEW TOPICS 



1. Name some duties of a Board of Health. 



2. Describe a good method for the disposal of garbage. 



3. In what manner is garbage detrimental to health ? 



4. In a cesspool what becomes of the solid part of sew- 



age ? What becomes of the liquid part ? 



5. In a septic tank what becomes of the solid part of 



sewage ? What becomes of the liquid part ? 



6. Describe a form of sewage disposal plant. 



7. Why is a driven pipe a safer source of water supply 



than an open well ? 



8. Describe a method of filtering river water that is to be 



used as the water supply of a city. 



9. What is meant by quarantine ? 



10. In what way are house flies detrimental to health ? 



1 1. How may we get rid of house flies ? 



12. What diseases do mosquitoes cause? How may we 



get rid of mosquitoes ? 



13. What powers have Boards of Health regarding the 



purity and freshness of foods that are offered for 

 sale? 



