"Allegory of connoisseurship of the arts", 1775, by Charles-Nicolas Cochin (1715-1790). Red chalk over black chalk on paper, with author signature. An engraving after this drawing was published as the frontispiece to: "Catalogue raisonné des différens objects de curiosités dans les sciences et arts" (Paris : F. Basan and G. Desprez, 1775). TypDr 715.C294.75a, Houghton Library, Harvard University