I'm probably obsessing about the "roget that" Q remark too much, but here's another interesting note regarding Roget. Seriously would make a marvelous Anon:
‘He even approached one of his favorite pastimes, chess, as if it were an academic discipline (decades later, he published the celebrated theoretical paper “Description of Moving the Knight over Every Square of a Chess-Board Without Going Twice over Any One” in a philosophical journal).’ http://www.chesshistory.com/winter/extra/roget.html
