Montanus remarks naïvely in his introduction that many of the pious authors of the expurgated books, who had died and who in the future world had come to know the truth, would, if they could return to earth, be very ready to be thankful to their censors. Especially would this be true of those writers whose works as originally issued had been without blemish, but the later editions of which had called for censorship to eliminate pernicious notes and commentaries. Living authors might in like manner have cause for gratitude to the censors, who had through their labours rendered valuable and available books which otherwise it would have been necessary to suppress; and, adds Montanus, certain authors had written to express their appreciation of the service. The larger part of the work of preparing the expurgated text came upon the theological faculty of Louvain. In May, 1570, for instance, the Louvain divines took up the task of correcting the notes and comments of Erasmus on Irenaeus, Jerome, and Augustine. Their report was presented in November of the same year. Later in the year, they were engaged upon the complete works of Erasmus, a more serious undertaking. The list of expurgations for Erasmus covers twenty-three pages. Among the divines who took part in this work was Henry Boxhorn who afterwards became a Protestant. The writings of Reuchlin and Bertram were confided to the faculty of Douai. The latter gave special trouble to the expurgators in connection with his book, _De Corpore et Sanguine Domini_, which called for a full measure of analysis and elimination. The critique upon this book takes the ground that, “It was in order,” in judging of the ancient Catholics, “to bear with many errors, to extenuate, excuse, and even by some ingenious device to deny” (what the old author has affirmed) “and to fabricate a convenient interpretation for any statements which could be objected to in controversy as unsound.” Reusch speaks of the convenient form in which the expurgated texts were presented by these Antwerp editors, who in a number of cases printed in full (properly indicated by the type) the sentences which were to be cancelled, while the Spanish editions give of these sentences only the first and last words. A copy of the Antwerp Index was submitted in due course by Duke Alva to the Pope, Pius V. Montanus writes from Rome, in November, 1571, that the work was not favourably received by the authorities, who inclined to the opinion that the Antwerp editors had taken undue liberties with the classification and conclusions arrived at by the Fathers of Trent.[163] In 1572, Gregory XIII, in instructing the Congregation of the Index to prepare a new Index, recalled any authorisations previously given to faculties or other bodies for the expurgation of books. As a result, the Index of Antwerp remains, excepting those prepared in Spain, and the single one of the kind issued in Rome, the only expurgatory Index in the series.