Karl Pearson Correspondence Correspondence to and from Karl Pearson, found with E S Pearson's papers. Includes letters between KP and ESP dated 1912-1936; letters from KP to Gertrude Jones c1910-1933; letters and copies of letters regarding the Raymond Pearl manuscripts and the American Philosophical Society Library; letters to KP from Sir Martin Conway 1901-1934; and copies of letters between KP, Francis Galton and W F R Weldon. Early 20th Century