 In 1876 Sidgwick married Eleanor Mildred Balfour, the sister of his former student, Arthur Balfour, the future prime minister. An accomplished and independent woman with serious scientific interests—she collaborated with her brother-in-law Lord Rayleigh on many scientific papers—Eleanor Sidgwick worked as an equal partner with her husband on many fronts, particularly higher education for women and parapsychology. She eventually took over as Principal of Newnham in 1892, and was for many decades a mainstay of the Society for Psychical Research, an organization that Henry had helped to found (in 1882) and several times headed, though his interest in the paranormal had been evident long before. The Sidgwicks hoped that their psychical research might ultimately support some core religious claims, particularly concerning the personal survival of physical death, which they deemed a vital support for morality. Their extensive and often quite methodologically sophisticated investigations were not as conclusive as they had hoped, but following Henry’s death from cancer on August 28, 1900, Eleanor did become persuaded that he had succeeded in communicating from “the other world.” The Sidgwicks’ work in this field continues to this day to be debated by academic parapsychologists (Gauld 1968, and Braude 2003).