Companion to a 2009 exhibition celebrating "the 200th birthday of Charles Darwin and the 150th anniversary of the publication of the 'Origin of Species.'" It focuses on "a significant period in Darwin's life that has thus far received little attention -- the twenty-two years following the publication of 'Origin.'" Features annotated images on topics such as mating displays and expression of emotions. Also includes links. From Cornell University Library and Museum of the Earth.