The papers contain diaries of Prothero's private and public life within the Universities of Cambridge and Edinburgh and in London from the start of his Fellowship at King's College until his death, 1872-1922; travel diaries for the United States, 1909-10, Germany, Russia and Austria, 1914 and France, 1916; address and visitors' books, 1890-1915; author index to the Quarterly Review, 1895-1921.