To be perfect in its ventilation, every room in the house, even to the closets, should be so arranged that a current of air _may_ pass through, to keep it pure and dry. In living rooms, fresh air in sufficient quantity may usually be admitted through the doors. In sleeping rooms and closets, when doors may not be left open, one or more of the lower panels of the door may be filled by a rolling blind, opening more or less, at pleasure; or a square or oblong opening for that purpose, may be left in the base board, at the floor, and covered by a wire netting. And in all rooms, living apartments, as well as these, an opening of at least sixty-four square inches should be made in the wall, near the ceiling, and leading into an air flue, to pass into the garret. Such opening may be filled by a rolling blind, or wire screen, as below, and closed or kept open, at pleasure. Some builders prefer an air register to be placed in the chimney, over the fireplace or stove, near the ceiling; but the liability to annoyance, by smoke escaping through it into the room, if not thoroughly done, is an objection to this latter method, and the other may be made, in its construction, rather ornamental than otherwise, in appearance. All such details as these should be planned when the building is commenced, so that the several flues may be provided as the building proceeds. In a stone or brick house, a small space may be left in the walls, against which these air registers may be required; and for inner rooms, or closets, they may pass off into the openings of the partitions, and so up into the garret; from which apertures of escape may be left, or made at the gables, under the roof, or by a blind in a window. For the admission of air to the first floor of the house, a special opening through the walls, for that purpose, can hardly be necessary; as the doors leading outside are usually opened often enough for such object. One of the best ventilated houses we have ever seen, is that owned and occupied by Samuel Cloon, Esq., of Cincinnati. It is situated on his farm, three miles out of the city, and in its fine architectural appearance and finished appointments, as a rural residence and first-class farm house, is not often excelled. Every closet is ventilated through rolling blinds in the door panels; and foul air, either admitted or created within them, is passed off at once by flues near the ceiling overhead, passing into conductors leading off through the garret.