each room, opening into the chimney-flue: then, even if a stove is used,
the flue can be kept heated by the extension of the stove-pipe some
distance up within the chimney, and the ascending current of hot air will
draw the foul air from the room into the flue. This, as before stated,
must be completed by a fresh-air opening into the room on another side: if
no other can be had, the top of the window may be lowered a little. The
stove-pipe _extension_ within the chimney would better be of cast-iron, as
more durable than the sheet-iron. When no fire is used in the
sleeping-rooms, the chimney-flue must be heated by pipes from the kitchen
or other fires; and, with the provision for _fresh_ air never forgotten,
this simple device will invariably secure pure and well-oxygenated air for
breathing. "Fussy and expensive," may be the comment; but the expense is
less than the average yearly doctor's bill, and the fussiness nothing that
your own hands must engage in. Only let heads take it in, and see to it
that no neglect is allowed. In a southern climate doors and windows are of
necessity open more constantly; but at night they are closed from the fear
referred to, that night-air holds some subtle poison. It is merely colder,
and perhaps moister, than day-air; and an extra bed-covering neutralizes
this danger. Once accustomed to sleeping with open windows, you will find
that taking cold is impossible.

If custom, or great delicacy of organization, makes unusual sensitiveness
to cold, have a board the precise width of the window, and five or six
inches high. Then raise the lower sash, putting this under it; and an
upward current of air will be created, which will in great part purify the
room.

Beyond every thing, watch that no causes producing foul air are allowed to
exist for a moment. A vase of neglected flowers will poison the air of a
whole room. In the area or cellar, a decaying head of cabbage, a basket of