Autograph Letter Signed, accepting an invitation to breakfast. 1 page 4 x 3½ inches, in good condition, minor blemishes only. 7 Fitzroy Square, 5 June 1854. Gustav Friedrich Waagen (1794–1868), German art historian. A pamphlet on the brothers Van Eyck led to his appointment to the directorship of the newly founded Berlin Museum in 1832. The result of a journey to London and Paris was an important publication in three volumes, Kunstwerke und Künstler in England und Paris (Berlin, 1837-1839), which became the basis for his more important The Treasures of Art in Great Britain, translated by Elizabeth Eastlake, (4 vols, London, 1854 and 1857). This remains a key source for the provenance of paintings then in England.