Waring says, —

"The entire sewage of Dantzic, on the Baltic Sea, where the climate is quite
as severe as anywhere in New England, has the entire effluent of its very com-
plete system of sewerage well purified, winter and summer, hy surface irriga-
tion. About one-eighth of the sewage of Paris, made very foul by the removal
of street-dirt in a putrid condition by the sewers, and by the very considerable
contamination coming from public urinals and other sources, is perfectly puri-
fied by agricultural processes on the plain of Gennevilliers. A large portion of
Berlin now sends all of its sewage to the irrigation-fields at Osdorf, where it is
completely purified. Croydon, in England, which is a larger city than Worces-
ter, has most successful purification-works close to its border. The great health-
resort, Malvern, purifies its sewage by intermittent filtration. So does Kendal
in the noi'th. Leamington and Eugby use broad irrigation. Over fifty other
towns in England purify their sewage in a similar manner. The places named
I have visited personally, and I have made a careful examination of their pviri-
fication-works. I might cite other towns where satisfactory purification is
effected by chemical processes ; but these seem to me so unsuited to the condi-
tions we are considering, that the discussion of chemical purification is hardly
worth while. Suitable works on either of the plans submitted can with entire
safety be adopted for Worcester.
