London: 1891. Single sheet of Nightingale's "10, South Street" stationery, with black border. Stationery: 7" x 4-3/8". ANs housed in an archival mylar sleeve. Horizontal fold lines. Foxing. "Paid" stamp at top of letter [from the Congress accounting staff?]. About Very Good. Item #33402.5
Nightingale inquires about her brother-in-law making a "contribution of Ten Guineas to your congress", i.e., International Congress Hygiene & Demography.