Letters and Publication Regarding Twins and Freemartins Copy of The Livestock Journal, featuring a review of Galton's paper "The History of Twins, As A Criterion of the Relative Powers of Nature and Nurture" and a request for readers to send in information about "free-martins" [freemartins]. Letters received by Galton on the subject of freemartins. [Freemartin is the term given to a female animal born as a twin to a male, typically sterile and in cattle partly maculinised]. 1876