Christine Ladd-Franklin (1847-1930) was a noted logician and psychologist who added to the literature in both fields during the late nineteenth and early twentieth centuries. She proposed the antilogism, a major contribution to the fie ld of logic. As a psychologist, she contributed theories of color vision. Despite her contributions, she was denied acceptance in the scientific community because she was a woman.

Ladd-Franklin was born Christine Ladd in Windsor, Connecticut, on December 1, 1847. Her parents came from influential and well-to-do families. Her father, Eliphalet Ladd, was a New York merchant and the nephew of William Ladd, founder of the American Peace Society. Her mother, Augusta Niles Ladd, was the niece of John Milton Niles, former postmaster-general of the United States. Augusta Ladd was a staunch supporter of women's rights who often attended suffrage meetings. In a letter to her sister, Augusta described a lecture she had attended, saying...