Hints have been thrown out from time to time by various writers that certain ideas in the Old Testament might be ascribed to Persian influences, and be traced back to the Zend-Avesta, the sacred writings of Zoroaster. Much progress has been made in the deciphering of these ancient documents, since Anquetil Duperron brought the first instalment of MSS. from Bombay, and since the late Eugène Burnouf, in his 'Commentaire sur le Yasna,' succeeded in establishing the grammar and dictionary of the Zend language upon a safe basis. Several editions of the works of Zoroaster have been published in France, Denmark, and Germany; and after the labours of Spiegel, Westergaard, Haug, and others, it might be supposed that such a question as the influence of Persian ideas on the writers of the Old Testament might at last be answered either in the affirmative or in the negative. We were much pleased, therefore, on finding that Professor Spiegel, the learned editor and translator of the Avesta, had devoted a chapter of his last work, 'Erân, das Land zwischen dem Indus und Tigris,' to the problem in question. We read his chapter, 'Avesta und die Genesis, oder die Beziehungen der Eranier zu den Semiten,' with the warmest interest, and when we had finished it, we put down the book with the very exclamation with which we began our article. We do not mean to say anything disrespectful to Professor Spiegel, a scholar brimfull of learning, and one of the two or three men who know the Avesta by heart. He is likewise a good Semitic scholar, and knows enough of Hebrew to form an independent opinion on the language, style, and general character of the different books of the Old Testament. He brings together in his Essay a great deal of interesting information, and altogether would seem to be one of the most valuable witnesses to give evidence on the point in question. Yet suppose him for a moment in a court of justice where, as in a patent case, some great issue depends on the question whether certain ideas had first been enunciated by the author of Genesis or the author of the Avesta; suppose him subjected to a cross-examination by a brow-beating lawyer, whose business it is to disbelieve and make others disbelieve every assertion that the witness makes, and we are afraid the learned Professor would break down completely. Now it may be said that this is not the spirit in which learned inquiries should be conducted, that authors have a right to a certain respect, and may reckon on a certain amount of willingness on the part of their readers. Such a plea may, perhaps, be urged when all preliminary questions in a contest have been disposed of, when all the evidence has been proved to lie in one direction, and when even the most obstinate among the gentlemen of the jury feel that the verdict is as good as settled. But in a question like this, where everything is doubtful, or, we should rather say, where all the prepossessions are against the view which Dr. Spiegel