EISENACH, the capital of the above principality, is situated at the confluence of the Hörsel and Nesse, 42 miles W. of Weimar. Pop., including suburbs, about 10,000. The town is surrounded by walls, and is clean and well-built. It has a handsome ducal palace, several churches and hospitals, a town-hall, library, mint, gymnasium, normal school, and school for foresters. The chief manufactures are woollen, linen, and cotton goods, soap, white lead, and leather. About a mile and a half S. of the town is the celebrated castle of Wartburg—once the residence of the landgraves of Thuringia—in which Luther was confined for ten months, after his return from Worms, under the friendly arrest of the Elector of Saxony. The chapel in which he preached, and the cell which he occupied, have been carefully preserved.