Melissa N. Stein’s Measuring Manhood tackles the complex intersections of race, gender, sexuality, and their attendant “sciences” across a century of US history. While the burgeoning fields of ethnology and sexology were equally prominent in Europe during this period, her focus on the US specifies the ways in which American “racial scientists” and sexologists differed from their European counterparts, as their research was often used to justify or bolster nation-specific cultural norms and legislation. The concept of masculinity was not simply a matter of “manhood” in the narrow sense, but carried with it a glut of other associations: humanity, civilization, citizenship, intelligence, morality, whiteness, cisgender heterosexuality, and middle-class restraint. Stein manages to convey the complexity and reciprocity of these constructions in each chapter with careful argumentation and ample examples.