All this has changed. Many of the things that wrought vexation of spirit and physical back-ache have completely disappeared. Labour-saving devices have superseded labour-making contraptions. Windows, which were only lowered a little at the top on account of possible dust, are now opened wide that the occupants may enjoy fresh air. Vacuum and other cleaners have superseded tea-leaves and bass brooms. Open grates that heat the rooms and not merely the chimneys have almost driven the fixed-bar inconveniences out of existence. If the fireplace is not of brick or stone, the tiles usually have no more than a surround of wood scarcely wide enough to hold more than a couple of brass candlesticks, with perhaps a slightly wider centre for a clock.