[Footnote 4: How much different woods vary may be seen by the following table, taken from Filibert Roth, _Timber_, Forest Service Bulletin No. 10, p. 28: WEIGHT OF KILN-DRIED WOOD OF DIFFERENT SPECIES. ------------------------------------+--------------------------------- | Approximate. +-----------+--------------------- | | Weight of | +---------+----------- | Specific | 1 cubic | 1,000 feet | weight. | foot. | of lumber. ------------------------------------+-----------+---------+----------- | | Pounds | Pounds (a) Very heavy woods: | | | Hickory, oak, persimmon, | | | osage, orange, black | | | locust, hackberry, blue | | | beech, best of elm, and ash | 0.70-0.80 | 42-48 | 3,700 (b) Heavy woods: | | | Ash, elm, cherry, birch, | | | maple, beech, walnut, sour | | | gum, coffee tree, honey | | | locust, best of southern | | | pine, and tamarack | .60-.70 | 36-42 | 3,200 (c) Woods of medium weight: | | | Southern pine, pitch pine, | | | tamarack, Douglas spruce, | | | western hemlock, sweet gum, | | | soft maple, sycamore, light | | | sassafras, mulberry, | | | grades of birch and cherry | .50-.60 | 30-36 | 2,700 (d) Light woods: | | | Norway and bull pine, red | | | cedar, cypress, hemlock, | | | the heavier spruce and fir, | | | redwood, basswood, chestnut, | | | butternut, tulip, catalpa, | | | buckeye, heavier grades of | | | poplar | .40-.50 | 24-30 | 2,200 (e) Very light woods: | | | White pine, spruce, fir, white | | | cedar, poplar | .30-.40 | 18-24 | 1,800 ------------------------------------+-----------+---------+----------- ] [Footnote 5: For table of weights of different woods see Sargent, _Jesup Collection,_ pp. 153-157.] [Footnote 6: See Forestry Bulletin No. 70, pp. 11, 12, and Forestry Circular No. 108.]