 Thanks for their help to Daniel Calcutt, Christopher Coope, Roger Crisp, Wojdjech Jajdelski, Fred Kroon, Stephen Latham, Alan Millar, Adrian Moore, John Mullarkey, Duncan Pritchard, Christine Swanton, Alan Thomas, John Skorupski, Ed Zalta, and an audience at the Wednesday Seminar of the Institute for Advanced Studies in the Humanities, Edinburgh.