414 APPLIED PHYSIOLOGY 



2. Garbage should be kept dry and not allowed to ac- 



cumulate in heaps. 



3. In a cesspool the solid matter in household sewage 



liquefies and decays, and its liquid parts soak into 

 the soil. 



4. A septic tank is practically a water-tight cesspool. 



5. An effective method for the disposal of city sewage 



is to run it through a septic tank, then through an 

 oxygenating device, and then upon the surface of 

 plots of ground set aside for the purpose. 



6. An efficient method of purifying the water supply 



of a city is to have it stand in a reservoir and then 

 filter it through sand beds. 



7. Dust and dirt on a street contain bacteria of many 



diseases. 



8. Every case of contagious disease should be isolated 



from the rest of the community, and after the re- 

 covery of the sick person the sick room should be 

 cleaned and fumigated. 



9. House flies are disease carriers. Their breeding places 



are wet manure piles and garbage heaps. 



10. Mosquitoes cause malaria and yellow fever. Their 



breeding place is stagnant water. 



11. Boards of Health should enforce a high standard of 



purity and freshness in food that is offered for 

 sale. 



DEMONSTRATIONS 



179. Procure the rules and regulations of the local Board of Health, 

 and call the attention of the class to their important features. Many of 

 the state and city Boards of Health issue, for free distribution, circulars 

 on contagious diseases and disinfection. 



1 80. Have the class visit any water works and sewage disposal works 

 which may be in the vicinity of the school. Notice the cleanliness of 



