(d) Peninsula of Arabia, abounding in vast sandy deserts, and almost entirely occupied by nomad tribes. Its southern and eastern coasts render it, nevertheless, a most important seat of trade. In the north, Arabia Petræa, so called from the town of Petra. Inland, Arabia Deserta. In the south, Arabia Felix; rich, both in natural productions, being the native land of almost every kind of perfume, particularly frankincense; and also as being the ancient staple for the merchandise of India. Cities: Mariaba, Aden, etc. In the east, the trading town of Gerra, and the islands near the shore, Tylos and Aradus, (Bahrein,) both likewise marts for Arabian and Indian wares, particularly cinnamon from Taprobane (Ceylon).

2. Countries between the Euphrates and Tigris.

Mesopotamia.

(a) Mesopotamia; in the interior a sterile table land, entirely occupied by nomad hordes. Cities on the Euphrates: Thapsacus, Circesium, Cunaxa; in the north, Zoba or Nisibis.

Armenia.

(b) Armenia, north of the foregoing. Very mountainous; for a long time without cities, but at last it had Tigranocerta. Rivers: the Cyrus and Araxes, falling into the Caspian; and the Phasis, falling into the Black sea.

Babylonia.

(c) Babylonia, the southern part of Mesopotamia, from which it was separated by the Median wall. A level plain, remarkable for the richness of its soil; formerly, by its high cultivation, its canals and lakes, and the erection of dams, the most fruitful, and, from its situation, the most opulent staple of inner Asia. Cities: Babylon on the Euphrates, Borsippa.

Whether the account given by Herodotus, as an eyewitness, of the size and splendour of Babylon is not exaggerated?—Manner in which the great Asiatic cities arose out of the royal encampments of the nomad conquerors.

3. Countries between the Tigris and the Indus.