Seventy-five to one hundred feet in height. Three to six feet in diameter, rough, light-gray bark with loose scaly ridges. Color, Appearance, or Grain of Wood. Heartwood light brown, light buff sapwood, conspicuous medullary rays, close-grained. Structural Qualities of Wood. Hard, heavy, very strong, tough, durable, easily split. Representative Uses of Wood. Construction, agricultural implements, wheel stock. Weight of Seasoned Wood in Pounds per Cubic Foot. 46 (U. S. Forestry Div.).[17] 50. Modulus of Elasticity. 1,610,000 (average of 256 tests by U. S. Forestry Div.).[17] 1,370,000. Modulus of Rupture. 11,500 (average of 256 tests by U. S. Forestry Div.).[17] 15,800. Remarks. The principal white oak of Southern States; edible acorns devoured by cattle, whence its name. [p015] FOOTNOTE [Footnote 17: See page 6.] CHESTNUT OAK. _Quercus prinus Linn._ Nomenclature. (Sudworth.) Chestnut Oak (local and common name). Rock Oak (N. Y., Del., Pa.). Rock Chestnut Oak (Mass., R. I., Pa., Del., Ala.). Tanbark Oak (N. C.). Swamp Chestnut Oak (N. C). Mountain Oak (Ala.). Locality. Maine to Georgia, westward intermittently to Kentucky and Alabama. Best development in southern Alleghany Mountain region. Features of Tree. Seventy-five to eighty feet in height, three or four feet in diameter. Leaves resemble those of chestnut. Color, Appearance, or Grain of Wood. Heartwood dark brown, sapwood lighter, close-grained, medullary rays conspicuous. Structural Qualities of Wood. Heavy, tough, hard, strong, and durable in contact with soil. Representative Uses of Wood. Largely used for railway ties. Bark rich in tannin. Weight of Seasoned Wood in Pounds per Cubic Foot. 46. Modulus of Elasticity. 1,780,000. Modulus of Rupture. 14,600. Remarks. Prinus is a Greek name applied to a species of oak. [p016] POST OAK. _Quercus minor Sargent_, _Quercus obtusiloba Michx._ Nomenclature. (Sudworth.) Post Oak (local and common name). Iron Oak (Del., Miss., Neb.). Box White Oak (R. I.). Chêne étoilé (Quebec). Overcup Oak (Fla.). White Oak (Ky., Ind.). Box Oak (Md.). Brash Oak (Md.). Locality. East of Rocky Mountains--Massachusetts to northern Florida, westward intermittently to Nebraska and Gulf States. Features of Tree. Fifty to seventy feet in height, two to three feet in diameter. Low shrub in Florida. Blunt lobes or projections to leaves. Leaves clustered at ends of branches. Fine tree with rounded top. Color, Appearance, or Grain of Wood. Heartwood light or dark brown with lighter sapwood. Close-grained, annual rings well marked. Numerous and conspicuous medullary rays. Structural Qualities of Wood. Heavy, hard, strong, checks badly in drying. Durable in contact with soil. Representative Uses of Wood. Largely used, particularly in Southwest, for fencing, railway ties, and fuel; also for cooperage, construction, etc.