XXXVI.
WARMING AND VENTILATION.

Open fireplace nearest to natural mode by which earth is warmed and ventilated—Origin of diseases—Necessity of pure air to life —Statistics—General principles of ventilation—Mode of Lewis Leeds—Ventilation of buildings planned in this work—The pure-air conductor—The foul-air exhausting-flue—Stoves—Detailed arrangements—Warming—Economy of time, labor, and expense in the cottage plan—After all schemes, the open fireplace the best.