III.

Hereditarianism

Studies of heredity contributed another variety of social Darwinism in the late 19th century. In Hereditary Genius (1869), Sir Francis Galton, a British scientist and Darwin’s cousin, argued that biological inheritance is far more important than environment in determining character and intelligence. This theory, known as hereditarianism, met considerable resistance, especially in the United States. Sociologists and biologists who criticized hereditarianism believed that changes in the environment could produce physical changes in the individual that would be passed on to future generations, a theory proposed by French biologist Jean-Baptiste Lamarck in the early 19th century. After 1890, hereditarianism gained increasing support, due in part to the work of German biologist August Weismann. Weismann reemphasized the role of natural selection by arguing that a person’s characteristics are determined genetically at conception.