Th odore Rousseau (1812-1867), arguably the most important French landscape artist of the mid-nineteenth century and a leader of the so-called Barbizon School, occupies a crucial moment of transition from the idealizing effects of academic painting to the radically modern vision of the Impressionists. He was an experimental artist who rejected the traditional historical, biblical, or literary subject matter in favor of "unruly nature," a Romantic...