Journal December 1836
p13–14“When I mentioned G. as having received impulse from Winkelmann, Mr D. said that our Artist thought no better of Winkelman. He thought him a learned man but no true Kenner.”
Fuller, Margaret. "Journal December 1836." Houghton Library, Harvard University; MS Am 1086; Box 3.
Inferred Dana mentions Winckelmann in connection with Goethe's 'impulse' from him; the specific work is the Geschichte der Kunst des Alterthums (1764), Winckelmann's principal work and the standard reference on ancient art. Winckelmann named explicitly by Fuller (spelled 'Winkelmann'). Dana (reporting Washington Allston's view) calls Winckelmann 'a learned man but no true Kenner' — an art connoisseur.