Molino del Rey. A range of massive stone buildings, about 500 yards long, forming the western side of an inclosure which surrounds the rock and castle, groves and fields of Chapultepec, 2 miles southwest of the city of Mexico. These buildings were occupied by the troops of Santa Anna in September, 1847, to intercept the march of the American army under command of Gen. Scott upon the city of Mexico. They were attacked on the morning of the 8th by Gen. Worth’s division, and, after a severe contest, the buildings were captured, with a loss to the Americans of 787 killed and wounded (including 59 officers), out of 3447, the whole number engaged. The Mexican forces numbered about 10,000 men.

Mollwitz. A village of Prussian Silesia; to the east of it lies the celebrated battle-field where Frederick II. of Prussia gained his first victory over the Austrians, April 10, 1741.

Moluccas, or Spice Islands. A numerous group of islands in the Asiatic Archipelago, situated between Celebes on the west, and New Guinea on the east, and stretching from lat. 2° N. to lat. 9° S. They were discovered by the Portuguese about 1510; became dependencies of Holland, 1795; during the French war of 1796, however, they were taken by the British, who held possession of them till 1800, when they were returned to Holland. The islands were again occupied by the British in 1810, but were finally restored to the Dutch in 1814, by the treaty of Paris.

Molycrium. A town in the most southerly part of Ætolia; it was founded by the Corinthians, but was afterwards taken possession of by the Ætolians.

Mombas. A seaport town of Africa, on a small island, in a bay on the coast of Zanzibar. It was first visited by the Portuguese under Vasco de Gama in 1498. In 1505, Francisco de Almeida, the Portuguese viceroy of India, took and burnt the town; in 1529 the Portuguese returned and repeated their work of destruction, and retained the city from that date to 1720, when Mombas fell into the hands of the imam of Muscat, but he was soon dispossessed by a rebellion of the inhabitants. It was under British protection from 1824 to 1826, and is now governed by an Arab sheikh.

Momentum. Is that force possessed by a body in motion; and is measured by the product of the mass of the body into its velocity.

Mona (now Anglesey). An island off the coast of the Ordovices, in Britain; it was invaded by Suetonius Paulinus, 61, and was conquered by Agricola, 78.

Moncontour. A town near Poitiers, in France. Here Admiral Coligny and the French Protestants were defeated by the Duke of Anjou, October 3, 1569.

Mondovi. A town of Northern Italy, near the river Ellero, about 47 miles south from Turin. The town is defended by walls and a small citadel, and contains a great number of religious houses. The French, under Napoleon I., defeated the Sardinian troops, under Colli, near this town in 1796, and in 1799 the town was sacked by the French under Soult.

Monghir. A town of Hindostan, East Indies, situated on the southern bank of the Ganges. It was an object of contention between the kings of Behar and Bengal in the early part of the 16th century; taken by the British in 1763.