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Many typescripts of Horton's lectures, research studies, articles, and professional case histories, material gathered by the Cartesian Research Bureau, and correspondence, chiefly professional. The correspondence is largely that of Samuel Dana Horton, father of Lydiard, and includes eight letters of Moreton Frewen, three each of Robert Todd Lincoln, John Fiske, and C.W. Fremantle, one of President James A. Garfield, and typescript copies of nine from Henry James. There are two letters from Dr. Horton to his guardian, Frederick W. Holls, and one each to Horton from William James and William Howard Taft. The remaining indexed correspondence is with colleagues and professional associates. Some of the case histories contain correspondence as well as documentary material. Also, a diary of Lydiard H. Horton for July to December 1896, and copies of excerpts from the diary of Samuel Dana Horton, 1860, photographs, newspaper clippings, and printed pamphlets.