The labours of Anquetil Duperron, who first translated the Zend-Avesta, were those of a bold adventurer—not of a scholar. Rask was the first who, with the materials collected by Duperron and himself, analysed the language of the Avesta scientifically. He proved—
1. That Zend was not a corrupted Sanskrit, as supposed by W. Erskine, but that it differed from it as Greek, Latin, or Lithuanian differed from one another and from Sanskrit.
2. That the modern Persian was really derived from Zend as Italian was from Latin; and
3. That the Avesta, or the works of Zoroaster, must have been reduced to writing at least previously to Alexander's conquest. The opinion that Zend was an artificial language (an opinion held by men of great eminence in Oriental philology, beginning with Sir W. Jones) is passed over by Rask as not deserving of refutation.
The first edition of the Zend texts, the critical restitution of the MSS., the outlines of a Zend grammar, with the translation and philological anatomy of considerable portions of the Zoroastrian writings, were the work of the late Eugène Burnouf. He was the real founder of Zend philology. It is clear from his works, and from Bopp's valuable remarks in his 'Comparative Grammar,' that Zend in its grammar and dictionary is nearer to Sanskrit than any other Indo-European language. Many Zend words can be retranslated into Sanskrit simply by changing the Zend letters into their corresponding forms in Sanskrit. With regard to the Correspondence of Letters in Grimm's sense of the word, Zend ranges with Sanskrit and the classical languages. It differs from Sanskrit principally in its sibilants, nasals, and aspirates. The Sanskrit s, for instance, is represented by the Zend h, a change analogous to that of an original s into the Greek aspirate, only that in Greek this change is not general. Thus the geographical name hapta hendu, which occurs in the Avesta, becomes intelligible if we retranslate the Zend h into the Sanskrit s. For sapta sindhu, or the Seven Rivers, is the old Vaidik name of India itself, derived from the five rivers of the Penjâb, together with the Indus, and the Sarasvatî.
Where Sanskrit differs in words or grammatical peculiarities from the northern members of the Aryan family, it frequently coincides with Zend. The numerals are the same in all these languages up to 100. The name for thousand, however, sahasra, is peculiar to Sanskrit, and does not occur in any of the Indo-European dialects except in Zend, where it becomes hazanra. In the same manner the German and Slavonic languages have a word for thousand peculiar to themselves; as also in Greek and Latin we find many common words which we look for in vain in any of the other Indo-European dialects. These facts are full of historical meaning; and with regard to Zend and Sanskrit, they prove that these two languages continued together long after they were separated from the common Indo-European stock.
Still more striking is the similarity between Persia and India in religion and mythology. Gods unknown to any Indo-European nation are worshipped under the same names in Sanskrit and Zend; and the change of some of the most sacred expressions in Sanskrit into names of evil spirits in Zend, only serves to strengthen the conviction that we have here the usual traces of a schism which separated a community that had once been united.
Burnouf, who compared the language and religion of the Avesta principally with the later classical Sanskrit, inclined at first to the opinion that this schism took place in Persia, and that the dissenting Brahmans immigrated afterwards into India. This is still the prevailing opinion, but it requires to be modified in accordance with new facts elicited from the Veda. Zend, if compared with classical Sanskrit, exhibits in many points of grammar, features of a more primitive character than Sanskrit. But it can now be shown, and Burnouf himself admitted it, that when this is the case, the Vaidik differs on the very same points from the later Sanskrit, and has preserved the same primitive and irregular form as the Zend. I still hold, that the name of Zend was originally a corruption of the Sanskrit word khandas (i. e. metrical language, cf. scandere),[35] which is the name given to the language of the Veda by Pânini and others. When we read in Pânini's grammar that certain forms occur in khandas, but not in the classical language, we may almost always translate the word khandas by Zend, for nearly all these rules apply equally to the language of the Avesta.
In mythology also, the 'nomina and numina' of the Avesta appear at first sight more primitive than in Manu or the Mahâbhârata. But if regarded from a Vaidik point of view, this relation shifts at once, and many of the gods of the Zoroastrians come out once more as mere reflections and deflections of the primitive and authentic gods of the Veda. It can now be proved, even by geographical evidence, that the Zoroastrians had been settled in India before they immigrated into Persia. I say the Zoroastrians, for we have no evidence to bear us out in making the same assertion of the nations of Persia and Media in general. That the Zoroastrians and their ancestors started from India during the Vaidik period can be proved as distinctly as that the inhabitants of Massilia started from Greece. The geographical traditions in the first Fargard of the Vendidad do not interfere with this opinion. If ancient and genuine, they would embody a remembrance preserved by the Zoroastrians, but forgotten by the Vaidik poets—a remembrance of times previous to their first common descent into the country of the Seven Rivers. If of later origin, and this is more likely, they may represent a geographical conception of the Zoroastrians after they had become acquainted with a larger sphere of countries and nations, subsequent to their emigration from the land of the Seven Rivers.[36]
These and similar questions of the highest importance for the early history of the Aryan language and mythology, however, must await their final decision, until the whole of the Veda and the Avesta shall have been published. Of this Burnouf was fully aware, and this was the reason why he postponed the publication of his researches into the antiquities of the Iranian nation. The same conviction is shared by Westergaard and Spiegel, who are each engaged in an edition of the Avesta, and who, though they differ on many points, agree in considering the Veda as the safest key to an understanding of the Avesta. Professor Roth, of Tübingen, has well expressed the mutual relation of the Veda and Zend-Avesta under the following simile: 'The Veda,' he writes, 'and the Zend-Avesta are two rivers flowing from one fountain-head: the stream of the Veda is the fuller and purer, and has remained truer to its original character; that of the Zend-Avesta has been in various ways polluted, has altered its course, and cannot, with certainty, be traced back to its source.'