That these scriptures arose in the east of Iran is clear from the language of the Avesta. It exhibits a close relationship with the forms of the Veda and Sanskrit, the ancient language of the Arians in India. If, on the other hand, we compare the language of the Avesta with the ancient language of Western Iran as we possess it in the inscriptions of the Achæmenids, we find that both are merely different dialects of one language, but they differ in such a manner that the language of the inscriptions of Darius and Xerxes is less closely connected with Sanskrit than the language of the Avesta. This language then we may regard as the ancient speech of Eastern Iran, and this assumption is raised into evidence by the contents of the Avesta. These prove that the Avesta arose in the east of Iran, with even greater certainty than the songs of the Rigveda prove that that collection arose in the land of the Indus and the Panjab. The Avesta entirely ignores the west of Iran. No mention is made of Ecbatana and Pasargadæ, the abode of the Median and the Persian kings, though they reigned over the whole of Iran and Hither Asia; nor even of the nations of the west, the Medes and Persians. It speaks of the land of the seven streams, _i.e._ India (IV. 12), and the heat which prevails in that land;[46] it mentions the beautiful Harahvaiti (Arachosia) and Haetumat (afterwards Sejestan[47]): the latter is extolled as a beaming, glowing, brilliant country.[48] The knowledge of the Avesta is most accurate in the north-east. Here we find Airyana Vaeja, _i.e._ home or canton of the Airyas,[49] Çughdha (Sogdiana), Bakhdhi (Baktra), Mouru (Margiana, Merv[50]), Niça, between Bakhdhi and Mouru, Haraeva (Haraiva in the inscriptions; Herat, the land of the Areians), and Vehrkana, _i.e._ land of wolves (Hyrcania).[51] The furthest point known to the west is Ragha in Media, which, according to the Avesta, consists of three citadels or tribes.[52] These statements carry us very distinctly to the east of Iran, the region from Ragha to the Indus. Mouru is "the high," "the holy," and Bakhdhi's "high banner" is extolled. In this way this city was no doubt marked out as the seat of an important dominion, the centre of a kingdom.