provides a comparative analysis of the science education of adolescent boys and girls, and analyzes the evolution of girls'scientific interests from the antebellum era through the twentieth century. Kim Tolley expands the understanding of the structural and cultural obstacles that emerged to transform what, in the early nineteenth century, was regarded as a "girl's subject." As the form and content of pre-college science education developed, Tolley argues, direct competition between the sexes increased. Subsequently, the cultural construction of science as a male subject limited access and opportunity for girls.