A furious controversy, stimulated by personal rivalries and national jealousy, immediately arose. Du Perron was denounced as an impostor or an ignoramus, and his publication stigmatized as a wretched forgery of his own, or a gross imposition palmed upon him by some lying pundit. Sir William Jones and John Richardson, both distinguished English Orientalists, and Meiners in Germany, were the chief impugners of the document in hand. Richardson obstinately went beyond his data, and did not live long enough to retract; but Sir William, upon an increase of information, changed his views, and regretted his first inconsiderate zeal and somewhat mistaken championship. The ablest defender of Du Perron was Kleuker, who translated the whole work from French into German, adding many corrections, new arguments, and researches of great ability. His work was printed at Riga, in seven quarto volumes, from 1777 to 1783. The progress and results of the whole discussion are well enough indicated in the various papers which the subject drew forth in the volumes of the "Asiatic Researches" and the numbers of the "Asiatic Journal." The conclusion was that, while Du Perron had indeed betrayed partial ignorance and crudity, and had committed some glaring errors, there was not the least ground for doubt that his asserted discovery was in every essential what it claimed to be. It is a sort of litany; a collection of prayers and of sacred dialogues held between Ormuzd and Zoroaster, from which the Persian system of theology may be inferred and constructed with some approach to completeness. The assailants of the genuineness of the "Zend Avesta" were effectually silenced when, some thirty years later, Professor Rask, a well known Danish linguist, during his inquiries in the East, found other copies of it, and gave to the world such information and proofs as could not be suspected. He, discovering the close affinities of the Zend with Sanscrit, led the way to the most brilliant triumph yet achieved by comparative philology. Portions of the work in the original character were published in 1829, under the supervision of Burnouf at Paris and of Olshausen at Hamburg. The question of the genuineness of the dialect exhibited in these specimens, once so freely mooted, has been discussed, and definitively settled in the affirmative, by several eminent scholars, among whom may be mentioned Bopp, whose "Comparative Grammar of the Sanscrit, Zend, Greek, Latin, Lithuanian, Gothic, and German Languages" is an astonishing monument of erudition and toil. It is the conviction of Major Rawlinson that the Zoroastrian books of the Parsees were imported to Bombay from Persia in their present state in the seventh century of our era, but that they were written at least twelve centuries earlier.1