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With a system of sub-irrigation pipes which deliver foul matters into earth that is subject to the active operation of oxidizing influences, we need fear no contamination of the deep and unaërated soil. It would be better, however, where this system is used for the disposal of the outflow of soil-pipes, to avoid the use of wells.
All old vaults and cesspools should be filled with earth, and disinfected by the admixture of lime with the upper layers of the filling. The use of water-closets in all houses should be made imperative; and the construction and arrangement of soil-pipes and of all outlets should be regulated by the health authorities.
It is not worth while here to discuss the details of the construction of water-closets and other interior plumbing work, except with reference to soil-pipes and such drains as may deliver the outflow of soil-pipes to the public sewer.
Where houses are near enough to make the use of a public sewer advisable, the aggregate of these soil-pipes, having almost constantly an upward current, will make such a draught upon the sewer, to be supplied by a downward current through the man-hole covers, as will maintain a perfect and continuous ventilation.
In this the whole of the pipes can be placed the soil-pipes, the lavatorium and plunge bath wastes, &c., and access gained to them by a manhole. By this means a cut-off could be effected between waste-pipes and the sewerage system. The culvert itself could be ventilated by connecting it with an extraction flue.
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