This study explores the ways in which George Eliot's involvement with contemporary scientific theory affected the evolution of her fiction. Drawing on the work of such theorists as Comte, Spencer, Lewes, Bain, Carpenter, von Hartmann and Bernard, Dr Shuttleworth shows how, as Eliot moved from Adam Bede to Daniel Deronda, her conception of a conservative, static and hierarchical model of society gave way to a more dynamic model of social and psychological life.