[1-54] Letters from Fitzroy to his father, his brother George Fitzroy and his sisters Emily Fitzroy and Frances Rice Trevor, 1816-1843. Many of the letters were written from ships (H.M.S. Glendower, Hind, Thetis, Ganges and Beagle) and ports of call in the Mediterranean and South America. They include long descriptions of topography, local events and peoples, naval matters and the progress of the survey.
[55-70] Correspondence of Fitzroy, his aunt Frances Anne, the Marchioness of Londonderry, and his brother-in-law Lord Dynevor, 1852, concerning Lady Londonderry's unsuccessful adoption of Fitzroy's daughter Emily after the death of Fitzroy's first wife.
[71-75] Miscellanea, undated letters and covers.