This collection contains the correspondence of the Alsop and Brown families, particularly Othniel Alsop, Hannah Brown Alsop, and Othneil's English siblings, Ann and Robert Alsop. Other correspondents include Alice Jackson, Mary Coffin, and Ann Douglas. Also included are Othniel's naturalization documents, various wills, and calling cards from friends. Of particular interest is a letter dated 1799 from Othniel Alsop to sister in England, describing the "contagious fever" (yellow fever), a letter dated 1803 from John Ives describing sickness in Philadelphia, and one dated 1815 from R. Redman writing to his cousin Hannah Brown Alsop"a good account of Quakers helping one another in time of need." Also included is a letter dated 1828 from Othniel Alsop to wife Sarah, describing travels as a Quaker minister, a letter dated in 1829 from Othniel to his brother Robert, describing religious journeys and societies in New Jersey, Ohio, Indiana, and N.Y., and an undated letter from Othniel Alsop to brother Robert, discussing Quaker and Christian doctrine.