[1] His younger brother was John Beresford Leathes, a distinguished physiologist who was elected a Fellow of the Royal Society in 1911.
[5] In June 1902, he was appointed deputy to Lord Acton, Regius Professor of Modern History, who died only a week later.
[6] Leathes had helped Lord Acton plan the Cambridge Modern History, and with A. W. Ward and G. W. Prothero edited it between 1901 and 1912.
[5] Sir Stanley Mordaunt Leathes died at Barnwood House, a nursing home near Gloucester, on 25 July 1938.
Leathes's publications include Vox Clamantis: Essays on Collectivism (1911) under the pseudonym Numa Minimus; under his own name he published Eton: Life in College (1881), edited A Grace Book Containing the Proctors' Accounts and Other Records of the University of Cambridge for the years 1454–1488 (1897), The Claims of the Old Testament (1897), The People of England (3 vols., 1915–23), The Teaching of English at the Universities (1913), What is Education?