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gratitude to a German friend in Rome who procured for me the opportunity of studying a work that was not to be found in any public library. Last, but not least, my sincerest acknowledgments are due to the authorities of the Leyden University Library, who, in response to a request made on my behalf by Mr. Bullen, sent a rare and probably unique volume to England so that it might remain at the British Museum long enough for its complete transcription.
The facsimile title-pages of the volumes in the Bodleian were executed at the University Press, Oxford; those of the British Museum books and of the Leyden volume were executed by Mr. Praetorius; and that of the Manuale of Cerqueira Luis de Cerqueira, a Jesuit bishop and author. by Signor Martelli. My attempts to procure facsimile titles of other books in Rome have been unsuccessful, owing to that gentleman's inability to find time for taking the necessary negatives.