a range of mountains in Rajpootana, extending about 300 miles from north-east to south-west, where they are separated from the Vindhya mountains by the valley of the river Mhye. The Aravulli form a series of ridges, covering a breadth of from 6 to 60 miles, with a general elevation of 3600 feet. They rise abruptly from the western desert, but fall gradually towards the east. Their general geological character is of primitive formation, with rocks of granite, compact dark blue slate, gneiss, and sienite; and the summits of the diverging ranges, west of Ajmere, are quite dazzling, says Colonel Tod, not with snow like the Himalayas, but with enormous masses of vitreous rose-coloured quartz. To the north of Komulmair, 25° north latitude, two of their ridges form a continuous table-land between them, 6 to 20 miles in width, as far as Ajmere, where it breaks up from the tabular form, and sends off numerous branches of low rocky hills, through Jeypour and Alwar, which reach the Jummah in the vicinity of Delhi. That part of the range between Komulmair and Ajmere, called Mairwarra, or the region of hills, is inhabited by the Mairs, a branch of the Mairs, one of the aboriginal tribes of India, who have lived for ages by robbery, being at constant war with their Rajpoot neighbours. They have yielded, however, to British influence, and give fair promise of becoming a civilized and industrious people.

**ARBACES** was governor of Media under Sardanapalus king of Assyria. Disgusted by the effeminacy of the king, he stirred up his people to revolt, and dethroned Sardanapalus, who thereupon burnt himself in his palace. Arbaces founded the monarchy of the Medes, which lasted 317 years under eight kings, till Astyages was expelled by Cyrus. Arbaces reigned 28 years, and died B.C. 848. (Diodorus, iii.) Herodotus gives a different account; but the authority of Ctesias, whose original work has perished, is followed by most ancient historians. (V. Paterculus i.6; Justin, i. 3; Strabo, xvi. 737.)