a town of Württemberg, in the circle of Schwarzwald, stands in a picturesque situation on the left bank of the Neckar, 7 miles W. of Tubingen. It is walled, and entered by eight gates; while the suburb Elangen, on the other side of the river, is joined to the town proper by a bridge. Among the handsome houses which line its broad thoroughfares rise many ancient and interesting buildings; as the old castle of the counts of Hohenberg (now used as a prison), several former convents, a Jesuit college (now the episcopal palace), the cathedral of St Martin, and several other churches of much beauty. The manufactures of the place comprise musical instruments, glass, leather, paper, and other articles. Pop. 6610.

ROTUNDA, or ROTUNDO, a term applied to a building which is circular in its plan, both externally and internally. The technical application of the word is restricted to circular buildings whose height does not greatly exceed their diameter. The most celebrated rotundas of the ancients is the Pantheon at Rome, of which the external diameter is 188 feet; internal, 142; internal height, 142. The Radcliffe Library at Oxford is a polygon of sixteen sides and 104 feet in diameter; exterior height, 140 feet; interior diameter, 88 feet; interior height, 90 feet.