It follows from these premises that so-called sanitary fittings and plumbing are dangerous unless they are not only satisfactory in themselves, but are also properly connected with drains and sewers which are equally well designed and constructed. Cesspools ought always to be regarded with suspicion; old cesspools in the vicinity of buildings are positively dangerous. Everything must be so arranged that pollution of air, soil, and water-supply is reduced to the smallest possible amount.