Jasper Yeates (1745-1817) was a lawyer and Pennsylvania Supreme Court justice, one of the state's most successful colonial-era legal practitioners. After moving to Lancaster County in 1765, he became active in colonial and early federal affairs, first by supporting the Revolutionary struggle and later by serving as one of Lancaster's delegates to the State Convention of 1787, which ratified the U.S. Constitution. The Jasper Yeates Papers (1728-1910, bulk 1760-1816) consist mainly of correspondence and business and court/legal records related to the Yeates family. The bulk of this three linear foot collection reflect Yeates' personal life as husband, father, son, and friend, as well as his professional life as lawyer and judge in Pennsylvania; much of the material dated after Yeates' death was created by children and/or grandchildren.

Personal and professional correspondence of the chemist Robert Hare, including drafts of letters to editors of journals on such varied topics as fish guano, slaughterhouses, paper money, and the meaning of the term "Yankee annexations." The collection originally contained over 300 scrolls, since disbound, which contained drafts of letters, essays, and lectures, composed by Hare on ordinary sheets of paper, then pasted end to end, and rolled up. The essay and lecture topics include: chemistry, storms, slavery, currency, fire-fighting, capital punishment, railroads, the Smithsonian Institution, Michael Faraday, religion and Spiritualism, riots in Philadelphia, epidemics, underwater blasting, and Ralph W. Emerson; there is some verse. The collection also contains an account book of Hare and his wife, 1806-1829 (180 pp.; B/H22#3); a volume by Hare on Cyclones (tornadoes), n.d. (ca. 60 pp.; B/H22#4); and Samuel Powel, Jr.'s "Short notes on a course of antiquities at Rome... under M. Byre Antiquarian," 1764. (60 pp.).