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XVIII. — A Plan to prevent the Waste of Manure in Rivers 
lohich Jiow through Towns. By W. Popham, Esq., B.A., 
Oriel College. 
No. 1 . — Fleet Ditch Sewer. 
In the bank of the river, which at low water is dry, let there be formed 
a sewer parallel with the stream, joining Fleet Ditch Sewer at an obtuse 
angle, a few feet from its mouth ; at the bottom of this additional sewer 
let there be apertures, under which, in chambers, let there be placed 
half-decked punts, built with air compartments, so as to render them, 
when laden with deposit of sewer, the specific gravity of water. 
When tide is a few inches below the le.itil of port-holes, let the punts, 
filled with water, be floated into their respective chambers; after they 
are laden with deposit, at the same depth of water, let them be towed out, 
and replaced by duplicates. A valve closes aperture of sewer while 
boats are changed, and sliding hatch secures the punt. 
High watermark. 
Low Water mark. 
No. 2. — Ki?ig^s Scholars' Pond Sewer. 
In the open reservoir, near junction with Thames, let barges of simi- 
lar construction, long enough to reach across the channel, with decks 
hinged at bow and stern, and opening in the centre, be fi.\ed side by 
side, so as not to rise from the bottom. The decks to be kept open 
against the walls of the canal while the stream, which is very gradual, is 
passing: at falling tide let the laden barges, with closed decks, be 
towed out and replaced by empty ones. 
