to point out how the house-drains canbe deodorised as well as ventilated. An excellent plan would be to fix somewhere abovethe line of drain-pipe between the sewer and the placeof disconnection, a square perforated box containingcharcoal, which would purify the mephitic gases as theywere formed,… … at different levels, it would not be difficult to under-stand how the ventilating continuations of the soil-pipes of the lower placed houses might taint and per-haps dangerously infect the atmosphere of the housesabove. To avoid this, the top of the ventilating pipecould be fitted with a…
