An English lineal measure, containing three feet, or thirty-six inches; also 1760 yards make a mile. The square yard contains 3X3 = 9 square feet; 4840 square yards are an acre, and 3,097,600 a square mile. The cubic or solid yard contains (3X3X3) =27 cubic feet. The yard by which cloth is measured, is the lineal yard above-mentioned, but for convenience, divided into four quarters, or sixteen nails. This measure was instituted by Henry I. being the length of his own arm.