The papers consist of family correspondence, autograph albums, diaries, notebooks, financial records, photographs and memorabilia, principally of Leonard Woolsey Bacon, a physician, and of his first wife, Emma Waleska Schneeloch. The largest part of the papers is made up of Bacon's prescription books (1892-1937) containing diagnosis, prescriptions, and name, age and occupation for each patient. Also in the papers are the financial records of his practice (1907-1919) which, together with the prescription books, make an important record of the practice of medicine in New Haven in that period. In the family correspondence is a long series of letters (1886-1892) from Leonard Bacon to Emma Schneeloch during their courtship. Much of the correspondence is made up of letters from various members of the Bacon family who were opposed to the marriage. Emma Schneeloch sang with her sister, Emilie, with a band that traveled to the West in 1891. A diary kept by Emilie of this trip is in the papers. Also included are student papers from Vassar (ca. 1917-1921) and other memorabilia kept by Emma Waleska Bacon Evans, daughter of Leonard and Emma Bacon.