NUR ED-DIN, MAHMOUD, sultan of Syria, born at Damascus; the extension of his empire over Syria led to the Second Crusade, preached by St. Bernard; compelled the Crusaders to raise the siege of Damascus, which he made his capital; called to interfere in the affairs of Egypt, he conquered it, and made it his own, a sovereignty which SALADIN (q. v.) disputed, and which Nur ed-Din was preparing to reassert when he died (1117-1178).

NUeREMBERG (143), an interesting old Bavarian town on the Pegnitz, 95 m.  N. of Muenich, is full of quaint and picturesque mediaeval architecture in fine preservation; has valuable art collections, a fine library, and a museum; is noted for the production of watches, toys, wood, metal, bone carvings, beer, and chemicals, and exports large quantities of hops; was made a free imperial city in 1219, and retained independence up to 1806.

NUTATION, name given to a slight oscillatory movement noticeable in the celestial pole of the earth, due to the latter not being a perfect sphere.

NYANZA, ALBERT.  See ALBERT NYANZA.

NYANZA, VICTORIA, a large lake of Central Africa, in the Nile basin, at the sources of the river, and S. of the preceding, equal in extent to the area of Scotland, at an elevation of 3890 ft.; discovered by Captain Speke in 1858, and sailed round by Stanley in 1875.

NYASSA, LAKE, lake in East Africa, feeds the Zambesi; is 350 m. long by 40 broad, at an elevation of 1570 ft., and was discovered by Livingstone in 1859; the waters are sweet, and abound with fish; the regions bordering it on the S. and W. are called Nyassaland.

NYASSALAND, a region in Central Africa under British protection, lying round the shores of Lake Nyassa, the chief town of which is Blantyre; it is known also as the British Central Africa Protectorate, the administration being in the hands of a commissioner acting under the Foreign Office; the Europeans number some 300, and the natives 850,000, while the forces defending it consist of 200 Sikhs and 300 negroes; there are plantations of sugar, coffee, tobacco, &c., and almost the entire trade is with Britain.

NYAYA, the name of one of the six principal systems of Hindu philosophy, and devoted to the dialectics or metaphysics of philosophy.

NYMPHS, in the Greek mythology maiden divinities of inferior rank, inhabiting mountains, groves, seas, fountains, rivers, valleys, grottoes, &c., under the several names of OCEANIDES (q. v.), NEREIDS (q. v.), NAIADS (q. v.), OREADS (q. v.), DRYADS (q. v.), &c.; they are distinguished by their grace and fascinating charms.

NYNEE TAL, a place of resort in the summer season and a sanatorium in the North-West Provinces of India, 22 m.  S. of Almora, 6521 ft. above sea-level.

NYX (i. e.  Night), in the Greek mythology the goddess of night, the daughter of CHAOS (q. v.), and the sister of EREBOS (q. v.), one of the very first of created beings, the terror of gods, and by Erebos became the mother of AEther, pure light, and Hemera, daylight, as well as other entities of note.