Bunbury remarks, may be considered as constituting a kind of aera in the geographical knowledge of the Greeks. It does not appear, he adds, that it was ever repeated; and while subsequent researches added materially to the knowledge possessed by the Greeks of the valley of the Ganges and the more easterly provinces of India, their information concerning the great river Indus and the regions through which it flows continued to be derived almost exclusively from the voyage of Alexander and the accounts transmitted by the contemporary historians. After leaving the great confluence the first tribe Alexander reached were the _Sogdoi_, who appear as the _Sodrai_ in Diodôros, who states that Alexander founded among them on the banks of the river a city called Alexandreia in which he placed 10,000 inhabitants. The Sogdoi have been identified with the _Sohda_ Rajputs who now occupy the south-east district of Sindh about Amarkot, but who in former times held large possessions on the banks of the Indus to the northward of Alôr. This place, though now only a scene of ruins, was formerly, before it was deserted by the river, one of the largest and most flourishing cities in all Sindh. Saint-Martin takes it to have been the Sogdian capital, and thinks that the city which Alexander founded lay in its vicinity at Rôri, since right opposite to this place there rose in the middle of the river the rocky island of Bhakar, which presented every natural advantage for the site of a great fortress. Cunningham, however, would place the capital higher up stream, about midway between Alôr and Uchh, at a village which appears in old maps under the name of Sirwahi, and which may possibly represent the _Seori_ of Sindh history and the _Sodrai_ of Diodôros. In this neighbourhood lies the most frequented ghât for the crossing of the Indus towards the west _viâ_ Gandâva and the Bolan Pass; and as the ghâts always determine the roads, it was probably at this point of passage Krateros recrossed the Indus when he was despatched with the main body of the army and the elephants to return home through the countries in which that Pass lay. The name _Sodrai_, some think, represents the Sanskrit _Śûdra_ which designates the servile or lowest of the four castes. If this be so, the Sodrai may be regarded as a remnant of the primitive stock which peopled the country before the advent of the Aryans (_v._ Lassen, _Ind. Alt._ ii. p. 174; Saint-Martin, _Étude_, pp. 150-161; Cunningham, _Anc. Geog. of India_, pp. 249-256). NOTE S.—SINDIMANA