94 



BA CTERIA 



stays two hours. Thence the effluent is run into the stream. 

 It must be admitted that the bacterial treatment of sew- 

 age, though exhibiting such excellent results where it has 

 been given a fair trial, is still in a probationary stage. It 



Metal; 

 Screen! 



, Conduit to Beds 



-Filter Bed full of 

 Burnt Clay 



Exit Pipe 



Filter Bed empty 

 of Filtrant, showing 



Exit Pipe at the 



bottom 



FILTER-BEDS 



As Used at Sutton 



appears to stand on reason. The sludge of previous methods 

 is avoided. The sewage is entirely broken down, and the ef- 

 fluent is a comparatively pure one, yet taking back nitrogen, 

 as nitrate, to the soil. The whole change, indeed, in the 

 opinion of Dr. Dupre, is more effective and radical than in 

 chemical treatment. Further, it has been tested as regards 



