BEAUX-ARTS About 50 letters or pieces, mostly L.A.S. Yan d'Argent, Narcisse Berchère, Rosa Bonheur, Léon Bonnat, William Bouguereau, Jacques Brascassat, Alexandre Cabanel, Jules Cavelier, Chapu, Eugène Cicéri, Léon Cogniet, Blaise Desgoffe, Paul Dubois, Louis Français, Charles Garnier, Jean-Léon Gérome, Eugène Guillaume, Louis Hersent, Nelly Jacquemart, Arkhip Kouindji, Emmanuel Lansyer, Henri Lehmann, Louis Leloir (drawing), Émile Lévy, Léon Lhermitte, Albert Maignan, Ernest Meissonier, Aimé Millet, Nadar, Isidore Pils, Henri Regnault, Albert Robida, René de Saint-Marceaux, Théophile Schuler, Gabriel-Jules Thomas, etc., are among those who have contributed to the development of the work.