The titles of the works utilised or cited as authorities from which quotations have been made will be found in the bibliography. I have thought it desirable, for the convenience of later students of the subject, to include also in this bibliography the titles of certain other important works having to do with the subject of censorship, from which I did not have occasion or opportunity to make citations. I desire to express special acknowledgment to Dr. Mendham, whose _Literary Policy of the Church of Rome_ was published in London in 1834. The author made a thorough study of such of the Roman and Spanish Indexes as were within his reach, and he has been able to throw no little light upon the methods adopted in Church censorship. His vivacious treatise, which may be said fairly to bristle with controversial opinions and conclusions, constitutes a curious antithesis to the volumes of Reusch, who hardly permits himself to connect with his comprehensive catalogues and records any opinions whatsoever. For matters connected with the Inquisition, the authorities are the well-known _Histoire de l’Inquisition_ of Llorente, and the monumental _History of the Inquisition of the Middle Ages_ by Henry C. Lea. The first volume of Lea’s _History of the Inquisition in Spain_ comes into publication just as my own work is completed. For the history of the operations of the Church in Spain, operations which were largely conducted under the authority of the Spanish Inquisition, I have, however, been able to utilise Lea’s _Religious History of Spain_, which for this division of the subject-matter is the book most frequently cited. (In the Spanish chapters, in order to avoid the repetition of the full title, the reference has been made simply to “Lea,” and is to be understood as connected with the above volume.) For matters connected with the book-trade and with the influence on the work of the publishers of the regulations of the Index, the chief citations are from Kapp’s _Geschichte des Deutschen Buchhandels_ and from Putnam’s _Books and their Makers in the Middle Ages_. The leading authority for the modern Catholic view of the literary policy of the Church is the treatise on the Index by the Jesuit Father Hilgers, which was published in Freiburg as recently as 1905, and which is certainly a most forcible and effective example of controversial writing. A little volume by the Paulist Father Searle entitled _Plain Facts for Fair Minds_, published in New York in 1895, is valuable for its statement of the present policy of the Church in regard to the relation of faith with science and as to the rightful influence of the authority of the Church upon intellectual action. A treatise by Charles Dejob, a French Catholic, which came into print in Paris in 1885, has been found interesting for its effective presentation of the Gallican point of view, both of the present date and of the earlier centuries, in regard to controversial matters.