In winter, ventilation is best secured by means of a window-board. This
is a board the edge of which rests on the edge of the window-sill, the
ends being attached firmly to the window-frame. It affords a vertical
surface three or four inches high and situated three or four inches in
front of the window, so as to deflect the cold air upward when the
window is slightly opened. The air will then reach the breathing-zone,
instead of flowing on to the floor and chilling the feet, which is the
usual consequence of opening a window in winter. It seems tragic to
think that for lack of some such simple device, which anyone can make or
buy, there is now an almost complete absence of winter ventilation in
most houses.
