92 Scientific Proceedings, Royal Dublin Society. 



according to this view, the Dosaron must have been identical with 

 the modern Brahmini, which, in that portion of its course called the 

 Sunk (or Koel), included a diamond locality. I cannot regard this 

 identification as satisfactory, as it does not account for the Tyndis 

 intervening between the Dosaron and Mahnada, since, as a matter 

 of fact, the Brahmini and Mahanadi are confluent at their 

 mouths. . 



Lassen, however, identifies the Dosaron with the Baiturnee, and 

 the Tyndis with the Brahmini. This destroys the force of. his 

 remark as to the origin of the name of the former, since at its 

 nearest point it is many miles distant from Doesa. 



Another locality of Ptolomey's, said to be situated on the 

 Granges, in the country of the Sabarse, may, perhaps, be identical 

 with Tavernier's Soumelpour on the Koel; it was situated some 

 miles distant from the Ganges. Wherever it was, it produced 

 most diamonds. 



A third locality mentioned by Ptolomey has been variously 

 identified with Sambalpur and Weiragarh ^ in West Gondwaha, 

 the position of which last was not correctly known to either Eitter 

 or Lassen, though the fact of the existence of diamond mines there 

 had been recorded by Ferishta and Abdul Fazl. 



Ptolomey stated that Ceylon produced the beryl, hyacinth 

 (?= sapphire), and all sorts of metals; the last is, however, not the 

 case, Ceylon being rather poor in metallic ores. 



Under the name Bathana, a source of the onyx is mentioned 

 by Ptolomey ; this appears to have been a well-known locality at 

 Paithan on the Godaveri, which was alluded to as Plithana by the 

 author of the Periplus. 



The sardonyx mines of Ptolomey are probably identical with 

 the famous carnelian and agate mines of Rajpipla, or rather, as it 

 should be called, Eatanpur. 



The loadstone rocks of India, which attracted so much notice 

 by several early writers, were known to Ptolomey ; they may pos- 

 sibly be identified with certain hill ranges in Southern India which 

 mainly consist of magnetic iron. " Early writers connected their 

 presence with the fact that many of the vessels and boats engaged 

 in the Indian coasting trade contained no iron in their construction, 



^ See Economic Geology of India, p. 37. - /. c. p. 335. 



