By the late 1800's the populations in cities in the United States had increased dramatically. More people were living among people who were different from themselves. Often such encounters caused people to blame others for their own misfortunes or for larger society ills. An English mathematician, Francis Galton, sought to "solve" the problem of those deemed undesirable in this country in developing the pseudo-scientific theory of Eugenics--identifying and breeding the "best" traits in society. One of his biggest concerns was the supposed decline of intelligence because of the "breeding" between individuals deemed less intelligent. In 1904 he addresses this supposed problem in this essay from "Nature" magazine.