uncondemned, while for some comparatively insignificant tract space is made in the catalogue. While the selections from writers other than Catholic are devoted in the main to doctrinal and controversial literature, and were probably made up as the result of a general instruction to place on the list of prohibitions all works inimical to the true Faith, the Indexes include also a curious sprinkling of titles of what may be called miscellaneous literature, that is, of books having nothing to do with matters of doctrine, theology, or religion. The attempt to have some consideration given in the Indexes to the literature of the whole of Europe, caused the compilers to depend for their titles upon catalogues which, in many cases, they could not have had an opportunity of verifying. The Italian editors transcribed for these Roman Indexes titles of books which appeared from year to year in the announcement-lists of the Frankfort Book-Fair. Their opinions or guesses as to the pernicious character of a book so announced could be based only upon the name of the author, if this happened to be a well-known name, or upon the imprint and general character of the publisher whose name indicated of course the place of production. It was the case, however, with the publishing catalogues of Frankfort in the 16th and 17th centuries, as with similar catalogues in later centuries, that a certain proportion of the books announced never came into print at all. Either no sufficient subscriptions were secured, or there was a change in the plans of the publisher, or the author did not secure the necessary resources to ensure the undertaking, or the author died before the completion of his work. As a result, distinction and commemoration were secured in the Index for a number of books which never came into existence.