or MAGNESIA ALBA, in Chemistry, a peculiar kind of earth. See CHEMISTRY Index.

Black MAGNESIA. See MANGANESE, CHEMISTRY and MINERALOGY Index.

in Ancient Geography, a maritime district of Thessaly, lying between the south part of the Sinus Thermaicus and the Pegasaeus to the south, and to the east of the Pelagiotis. Magnetes, the people. Magnesius and Magnesius, the epithet; (Horace).

a town of Asia Minor on the Maeander, about 15 miles from Ephesus. Themistocles died there: it was one of the three towns given him by Artaxerxes, with these words, "to furnish his table with bread." It is also celebrated for a battle which was fought there, 190 years before the Christian era, between the Romans and Antiochus king of Syria. The forces of Antiochus amounted to 70,000 men according to Appian, or 70,000 foot and 12,000 horse according to Livy, which has been exaggerated by Florus to 300,000 men; the Roman army consisted of about 28,000 or 30,000 men, 2000 of whom were employed in guarding the camp. The Syrians lost 50,000 foot and 4000 horse; and the Romans only 300 killed, with 25 horse. It was founded by a colony from Magnesia in Thessaly; and was commonly called Magnesia ad Meandrum, to distinguish it from another called Magnesia ad Sipylum in Lydia at the foot of Mount Sipylus.

MAGNESIA ad Sipylum, anciently Tantalis, the residence of Tantalus, and capital of Maonia, where now stands the lake Sale. A town of Lydia, at the foot of Mount Sipylus, to the east of the Hermus; adjudged free under the Romans. It was destroyed by an earthquake in the reign of Tiberius.