But the two scholars whose opinions upon any subject within this department of learning are now the most authoritative are Professor Spiegel of Erlangen, and Professor Westergaard of Copenhagen. Their investigations, still in progress, made with all the aids furnished by their predecessors, and also with the advantage of newly discovered materials and processes, are of course to be relied on in preference to the earlier, and in some respects necessarily cruder, researches. It appears that the proper Zoroastrian Scriptures namely, the Yasna, the Vispered, the Vendidad, the Yashts, the Nyaish, the Afrigans, the Gahs, the Sirozah, and a few other fragments were composed in an ancient Iranian dialect, which may as Professor W. D. Whitney suggests in his very lucid and able article in vol. v. of the Journal of the American Oriental Society most fitly be called the Avestan dialect. (No other book in this dialect, we believe, is known to be in existence now.) It is difficult to say when these 1 Wilson, Parsi Religion Unfolded, p. 405. documents were written; but in view of all the relevant information now possessed, including that drawn from the deciphered cuneiform inscriptions, the most probable date is about a thousand years before Christ. Professor R. Roth of Tubingen whose authority herein as an original investigator is perhaps hardly second to any other man's says the books of the Zoroastrian faith were written a considerable time before the rise of the Achamenian dynasty. He is convinced that the whole substantial contents of the Zend Avesta are many centuries older than the Christian era.2 Professor Muller of Oxford also holds the same opinion.3 And even those who set the date of the literary record a few centuries later, as Spiegel does, freely admit the great antiquity of the doctrines and usages then first committed to manuscript. In the fourth century before Christ, Alexander of Macedon overran the Persian empire. With the new rule new influences prevailed, and the old national faith and ritual fell into decay and neglect. Early in the third century of the Christian era, Ardeshir overthrew the Parthian dominion in Persia and established the Sassanian dynasty. One of his first acts was, stimulated doubtless by the surviving Magi and the old piety of the people, to reinaugurate the ancient religion. A fresh zeal of loyalty broke out, and all the prestige and vigor of the long suppressed worship were restored. The Zoroastrian Scriptures were now sought for, whether in manuscript or in the memories of the priests. It would seem that only remnants were found. The collection, such as it was, was in the Avestan dialect, which had grown partially obsolete and unintelligible. The authorities accordingly had a translation of it made in the speech of the time, Pehlevi. This translation most of which has reached us written in with the original, sentence after sentence forms the real Zend language, often confounded by the literary public with