For country houses, if isolated from sewers, and where expense is no objection: water-carriage with subsoil drainage.
In villages and small towns, without sewers: subsoil drainage (for slops), and pails (for excreta), frequently removed by proper officers.
For farm-houses: subsoil drainage for slops, and a movable tank, with dry earth disinfection, for excreta.
For sea-side houses, isolated: if there is vegetation, subsoil drainage for slops, and earth-closets.
For sea-side villages: subsoil drainage and the pail system.
For sea-side houses, where there is no vegetation: for excreta, earth-closets or a movable iron tank, with dry-earth disinfection; for slops, a water-tight cesspool, with arrangements for emptying its contents into the sea when the tide is ebbing.
How to prevent contamination of the air from the ground.
Have the house separated from the soil on which it is built by a layer of asphalt between two layers of cement, extending over the whole cellar-floor, through the foundation-walls and up above the point where the ground touches the walls outside. Or have the house built without a cellar, and with perforated underpinning, so as to allow a free circulation of air underneath it. The subsoil should also be drained by tiles laid at least a foot lower than the cellar-bottom.
The cold-air boxes of furnaces should draw their supply from the external air. It is advisable to have a thin layer of cotton held in place by wire gauze to filter the air as it enters them.