Elisabeth Ladenson is a professor of literature , editor and director of the Department of French at the University of Columbia , New York. His last text, Dirt for Art's Sake , wonders : how a book becomes classic obscene ? To do this through Madame Bovary , Fanny Hill, The Flowers of Evil , Ulysses, The Well of Loneliness , Lady Chatterley's Lover , Tropic of Cancer , Lolita, and the works of the Marquis de Sade.