And meaningless seem the formulæ 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 new Appropriations of Lands. He has asked me to call that 'taking God's name in vain, Lily," said Mr. Ward.