These two catalogues have always been of extreme rarity and price. Dr. Lister, when at Paris, 1668, notices this circumstance. I have since met with them in the very curious collections of my friend, Mr. Douce, who has uniques, as well as rarities. The monograms of our old masters in one of these catalogues are more correct than in some later publications; and the whole plan and arrangement of these catalogues of prints are peculiar and interesting.