Christine Ladd began graduate studies in mathematics and logic at Johns Hopkins University.
On September 13, 1872, Christine Ladd began her graduate studies at Johns Hopkins University, a newly founded institution modeled on the German research university system and dedicated to advanced scholarship. At the time, Johns Hopkins did not officially admit women, and Ladd's entry required special petitioning and the direct intervention of the eminent logician Charles Sanders Peirce, who recognized her exceptional mathematical talent.
Her admission was a quiet but significant crack in the wall of institutional exclusion facing women in advanced scientific education. She was permitted to attend lectures and seminars, but her presence was often treated as exceptional and provisional rather than as an equal member of the graduate cohort. Despite these restrictions, she thrived academically, engaging deeply with symbolic logic, mathematics, and eventually psychology.
This moment set into motion a nearly half-century saga: Ladd would complete all requirements for a Ph.D. by 1876, yet be denied the degree itself because of her sex, only receiving it decades later in 1926. Her admission to Johns Hopkins represents one of the earliest instances of a woman penetrating elite American graduate education in the sciences, and it laid the intellectual groundwork for her later contributions to the algebra of logic and color vision theory.