Middletown, Pa., Dauphin co. Near the junction of Swatara and Susquehanna Rivers. 10 miles S. E. from Harrisburg. The Pennsylvania and Union Canals unite here. The place has an active trade in iron, coal, and lumber.

Frederick, Md., City, and seat of justice of Frederick co. Situated on Carroll Creek, 3 miles above its entrance into Monococy Creek, 43 miles W. from Annapolis, and 61 W. by N. from Baltimore. It lies on the old traveled road between Baltimore and Wheeling, and a short distance N. of the Baltimore and Ohio Railroad, with which it is connected by a branch 3 miles long at a point near the Monococy Viaduct.

Cambridge, Ms., City and one of the seats of justice of Middlesex co. This is the seat of Cambridge University, the oldest and best endowed of the colleges in the United States. It may be divided into three parts — Old Cambridge, where the college is situated, about 3 miles W. from Boston; Cambridgeport, a flourishing village, about midway between Boston and Old Cambridge ; and East Cambridge, where the county buildings are located, immediately connected with Boston by Cragie's Bridge over Charles River; also with the city of Charles- town by a bridge.