438 The Book of Woodcraft A cubic foot weighs 40 lbs. Md. to Iowa and south- ward. Sugar Maple, Rock Maple or Hard Maple (Acer saccharum) A large, splendid forest tree, 80 to 120 feet high; red in autumn. Wood hard, strong, tough and heavy but not durable. A cubic foot weighs 43 lbs. It enjoys with Beech, Hickory, etc., the sad distinction of being a perfect firewood. Thanks to this it has been exterminated in some regions. Bird's-eye and curled Maple are freaks of the grain. Leaves 3 to 5 inches long. Its sap produces the famous maple sugar. Man. to Nova Scotia and south to Gulf. Silver Maple, White or Soft Maple (Acer saccharinuni) Usually a Httle smaller than the Sugar Maple and much inferior as timber. Wood hard, close-grained. A cubic foot weighs 33 lbs. Leaves 5 to 7 inches long. This tree produces a Httle sugar. It is noted for its yellow foU- age in autumn. Nova Scotia to Minn, and south to Okla. and Ga.
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