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sation in the chimney, and trouble from this source is best avoided by ‘ preventing creosote formation, it is more likely to form when wood is used for fuel than when coal is tm'med and is more likely to form in cold than in mild climates. Green wood may contain as high as 40% water, and dry wood 15 to 20 percent. When wood is slowly burned* it gives off acetic and pyroligneous acid, which in combination with water or moist rue form creosote. When the draft is strong and an active fire in maintained, much of the creosote is carried off into the atmosphere. The trouble is aggravated when the fire does not burn briskly and when an outside flue is subjected to chilling blasts. The walls of the chimney, being camparatively cool, cause condensation of the vapors contained in the smoke. Thus the creosote condenses and runs down the flue, finding its way out of any joints that are not percfectly tight The formation of creosote is unusual m chimneys that are surrounded gy warm rooms. The outer walls of a diimney in an outside wall should be at least two bricks thick and the chimney should have a good flue lining.
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