FORT ANCIENT, prehistoric Indian defensive work on the Miami river in Warren county, Ohio, stands on a headland (26o 28o ft.) projecting from a plateau, and is now included in a State park. The total area is estimated at too acres, and its solid content at 3,000,00o cu. feet. The wall, chiefly of earth cast up from an inner ditch, follows the zigzag course of the bluff, except where it crosses the level neck in the rear of the fort, and is 18,712 feet, or a little more than 31 m. in length, while the height is 6 to to ft., except at the only level point of approach, the neck referred to above, where it is 18 to 19 feet. At the north the points more easily approached are generally narrow, sloping ridges, crossed at the upper terminus by a wall, outside of which the ridge was cut down several feet to present a steep slope corresponding to the outer slope of the wall; but where similar ridges form approaches from the south and at some other points, the defences are formed by raising the wall considerably above the usual height. The most vulnerable point was at the isthmus separating the two portions of the fort, known as the Old Fort and the New Fort, where a short space was undefended, though the ascent is not difficult. A short distance east of the posterior wall of the New Fort are two small mounds, from each of which extends a low stone wall running nearly parallel about a quarter of a mile and forming an irregular semicircle about another small mound. Several small mounds and a number of stone graves containing human remains were within the fort.