504 



WATER SUPPLY AND SEWAGE DISPOSAL 



cleaned, (4) that all piping is exposed so that possible leaks 

 are easily discovered. Carefully compare the fixtures and 

 plumbing of this room with those shown in Fig. 311. What 

 advantages do you see in their use? 



FIG. 312. A modern sanitary bathroom. 



592. The Drains. The drains in any building are of the 

 greatest importance, so far as sanitation is concerned. They 

 must be as constructed as quickly to dispose of all waste matter. 

 They must also be air-tight within the building. We have 

 seen that all organic matter is decomposed by microorganisms 

 (Art. 505). These microorganisms attack and decompose 

 the waste matter in the drains. During the process of de- 

 composition this waste matter often gives off large amounts 



