George William Erskine Russell,
Collections and Recollections
“ A marquis, properly regarded, is not so much a nascent duke as a magnified earl. A shrewd observer of the world once said to me: "When an earl gets a marquisate, it is worth a hundred thousand pounds in hard money to his family." The explanation of this cryptic utterance is that, whereas an earl's younger sons are "misters," a marquis's younger sons are "lords." ”
