"If in constructing or altering chimney fire-places, the rules laid down in my Essay on that subject are stricty adhered to, chimnies so fitted up will very seldom be found either to smoke, or to throw out dust into the room; and should they be found to have either of these faults, there is a remedy for the evil, as effectual, as it is simple and obvious: Bring down the mantle, and the throat of the chimney lower; and if it should be found necessary, reduce the width of opening of the fire-place in fronts and diminish the obliquity of the covings."