What did they think about masculinity and femininity? In her book, Evelyn Kirkley argues that their understanding of gender was more complex, ranging from biological determinism to historic constructionism. Kirkley asserts that "Freethinkers" accepted, rejected, and synthesized late Victorian gender norms, struggling both to achieve social and political respect and remain faithful to their principles. Most intriguing, she concludes, is their debate over man- and womanhood, which was a precursor to the late twentieth-century gender controversy in the academy, another institution prizing science, rationalism, and progress.