For one period of the Vatican Messrs. Duckworth & Co.'s beautifully produced edition of Mrs. Ady's Raffaelle is useful.
There is a little about the Vatican Library in Helbig's Guide to the Public Collections of Classical Antiquities in Rome, published by Baedeker. Baedeker's Central Italy is indispensable; it is so extremely well arranged, so sure to mention salient facts, like dates and measurements, which one has occasion to check. For the purpose of this volume I have not had occasion to use much that very picturesque book, Father Chandlery's Pilgrim Walks in Rome, published by the Manresa Press, though I have found it most useful in the larger work I am preparing about Rome. I understand that much information about Old St. Peter's is scattered through Father Barnes's large work on St. Peter in Rome, which I have not seen.
One of the best accounts of the Pope's apartments to be found anywhere is in Zola's Rome, of which the English edition is published by Messrs. Chatto & Windus, who are likewise the publishers of the cheap editions of Charles Reade's The Cloister and the Hearth, into which Nicholas v. comes; and Wilkie Collins's Antonina.
Far the most interesting volume of gossip about the Popes is Silvagni's La Corte e la Società Romana nei XVIII. e XIX. secoli, of
