Henry Cowles is a Ph.D. candidate in History and History of Science at Princeton University. His research centers on how developments in the life and human sciences (specifically psychology and evolutionary biology) overlap with larger trends in philosophical and social thought. In his dissertation, he explores this interaction in the form of methodological debates between philosophers, psychologists, and other scientists in the decades around 1900. At Harvard, he will focus on the impact of evolutionary accounts of mind on contemporaneous ideas about “public reason” in the early-twentieth-century United States.