I am in favor, therefore, of those plans of house-building which have wide central spaces, whether halls or courts, into which all the rooms open, and which necessarily preserve a body of fresh air for the use of them all. In hot climates this is the object of the central court which cuts into the body of the house, with its fountain and flowers, and its galleries, into which the various apartments open. When people are restricted for space, and cannot afford to give up wide central portions of the house for the mere purposes of passage, this central hall can be made a pleasant sitting-room. With tables, chairs, bookcases, and sofas comfortably disposed, this ample central room above and below is, in many respects, the most agreeable lounging-room of the house; while the parlors below and the chambers above, opening upon it, form agreeable withdrawing-rooms for purposes of greater privacy. It is customary with many persons to sleep with bed-room windows open,--a very imperfect, and often dangerous mode of procuring that supply of fresh air which a sleeping-room requires. In a house constructed in the manner indicated, windows might be freely left open in these central halls, producing there a constant movement of air, and the doors of the bed-rooms placed ajar, when a very slight opening in the windows would create a free circulation through the apartments. In the planning of a house, thought should be had as to the general disposition of the windows, and the quarters from which favoring breezes may be expected should be carefully considered. Windows should be so arranged that draughts of air can be thrown quite through and across the house. How often have we seen pale mothers and drooping babes fanning and panting during some of our hot days on the sunny side of a house, while the breeze that should have cooled them beat in vain against a dead wall! One longs sometimes to knock holes through partitions and let in the air of heaven. No other gift of God, so precious, so inspiring, is treated with such utter irreverence and contempt in the calculations of us mortals as this same air of heaven. A sermon on oxygen, if one had a preacher who understood the subject, might do more to repress sin than the most orthodox discourse to show when and how and why sin came. A minister gets up in a crowded lecture-room, where the mephitic air almost makes the candles burn blue, and bewails the deadness of the church,--the church the while, drugged by the poisoned air, growing sleepier and sleepier, though they feel dreadfully wicked for being so.