Correspondence, essays, and biographical material. Correspondence consists of professional correspondence with colleagues in astronomy, family correspondence, and letters of condolence on Chandler's death. Essays on scientific topics are from the early years of Chandler's career. Biographical material includes a will, vita, photographs, a birth, marriage, and death register for the Chandler family, and a eulogy service for S. Chandler. Correspondents include Benjamin Boss, B.A. Gould, Charles Minot, Simon Newcomb, H.H. Turner, and Chandler family members.