The antagonism on the part of the Protestant authorities of Basel to the circulation of the _Koran_ appears to have been more decided than that of the Inquisition. In 1536, the magistrates refused permission to Heinrich Petri to print an edition; and, in 1542, an edition printed by Oporinus was confiscated. The publisher appealed to the scholars, and the question of permitting the publication was discussed from the pulpits. On the receipt of an opinion from Luther in favour of Oporinus, the books were released on condition that when published they should not bear the imprint of Basel and that copies should not be sold within the city. This Valdes Index contains but four Spanish titles, the writings of Enzinas and of Urrea, an anonymous _Dialogue of Christian Doctrine_, and a Spanish version, printed in Geneva, of Calvin’s _Catechism_. This last title does not appear in later lists. _11._ _1554._ _Valladolid._ _Senate of the Inquisition.--Index expurgatorius. Censura generalis contra errores quibus recentes haeretici sacram scripturam asperserunt. Edita a supremo Senatu Inquisitionis, constituto adversus haereticam pravitatem, et apostasiam in Hispania, et aliis regnis, et dominis Caesareae majestatis subjectis. Pinciae, ex officina Francis Ferdinan. Corduben. cum privilegio Imperiali. 1554._ The text is known through the reprint by Ziletus in Venice, in 1562. The lists in this Index are devoted exclusively to Bibles, of which 103 editions are specified. Many of these find place in Louvain, 1550, and in Valdes, 1554, among the books entirely prohibited. Here, however, these Bibles are presented as open to censure on the ground of certain errors and heresies contained in the notes and introductions, which notes, etc., are ordered to be cancelled or expunged. Copies thus corrected (by cancellations) are permitted to be left in the hands of their owners. This Index of Valdes is the first example of an _Index expurgatorius_. A number of such expurgatory Indexes were produced later under the authority of the Spanish Inquisition, but outside of Spain, the attempts to control literature through the expurgation of books already printed were but few. The futility of such attempts came to be recognised at an early date.