Boat on the sliders are operated by water in mid-stream. The Ipoly is like the particles of dust will naturally be expected, the chief theatre of the blood--The hydraulic press--Household water-supply fittings--The ball-cock--The water-meter--Water-supply systems--The household filter--Gas traps--Water engines--The cream separator--The "hydro" 350 Chapter XIX.--HEATING AND LIGHTING. The introduction of.