good idea of the active industries of this very busy place. PITTSBURG DEVELOPMENT. This wonderful industrial development all came within the nineteenth century. There is still preserved as a relic of its origin the little block-house citadel of the old Fort Pitt, down near the point of the peninsula where the rivers join. This has recently been restored by the Daughters of the American Revolution--a small square building with a pyramidal roof. The surrounding stockade long ago disappeared. There is in the Pittsburg City Hall an inscribed tablet from Fort Pitt bearing the date 1764. The old building, which was the scene of Pittsburg's earliest history, for it stands almost on the spot occupied by Fort Duquesne, is among modern mills and storehouses, about three hundred feet from the head of the Ohio. Pittsburg, after an almost exclusive devotion to manufacturing and business, began some years ago to cultivate artistic tastes in architecture, and has some very fine buildings. There is an elaborate Post-office and an interesting City Hall on Smithfield Street; but the finest building of all, and one of the best in the country, is the magnificent Romanesque Court-house, built at a cost of $2,500,000, and occupying a prominent position on a hill adjoining Fifth Avenue. There is a massive jail of similar architecture, and a "Bridge of Sighs" connects them, a beautifully designed arched and stone-covered bridge, thrown for a passageway across an intervening street. The main tower, giving a grand view, rises three hundred and twenty feet over the architectural pile, and, as in Venice, the convicted prisoner crosses the bridge from his trial to his doom. There are attractive churches, banks and business buildings, and eastward from the city, near Schenley Park, is the attractive Carnegie Library and Museum in Italian Renaissance, with a capacity for two hundred thousand volumes, a benefaction of Mr. Andrew Carnegie, originally costing $1,100,000, to which he has recently added $1,750,000 for its enlargement. The residential section is mainly on the hills east of Pittsburg and across the Allegheny River in Allegheny City, there being many attractive villas in beautiful situations on the surrounding highlands.