1T2 ELEMENTS OF GENERAL SCIENCE 



in cesspools where they are accessible to flies as well as 

 sources of contamination to wells, and the barns and out- 

 buildings are in a condition that is a continual menace to 

 health. It is obviously impracticable to construct sewage- 

 disposal works which will serve an entire rural district as a 

 city is served by its sewer system. It is, however, entirely 

 practicable for each country residence to have its own indi- 

 vidual plant for this purpose as well as for the supply of 

 water. The main waste pipe of the house should empty into 

 a cesspool which should be so located and constructed as to 

 prevent contamination of water supply, diffusion of gases, or 

 access of flies. 



