The eugenics movement prior to the Second World War gave voice to the desire of many social reformers to promote good births and prevent bad births. Two sources of cultural authority in this period, science and religion, often found common cause in the promotion of eugenics. The rhetoric of biology and theology blended in strange ways through a common framework known as degeneration theory. Degeneration, a core concept of the eugenics movement, served as a key conceptual nexus between...