The Editor desires to express his indebtedness to the following, who have rendered valuable assistance in the preparation of this volume: Mr. A. Pit, Director of the Nederlandsch Museum voor Geschiedenis en Kunst, and other officials of the Rijks Museum, Amsterdam; Messrs. P.C.J.A. Boeles and D. Draaisma, of the Friesch Museum, Leeuwarden; Dr. B. van Rijswijk, Secretary of the Vereeniging Oud-Dordrecht; Mr. W. Polman Kruseman, Secretary of the Zeeuwsch Genootschap der Wetenschappen, Middelburg; and the Directors of the British Museum, the Victoria and Albert Museum, the National Gallery, and the Wallace Collection, London.