By Berkeley, George, Robinson, Howard
By Charles Darwin, Gillian Beer (Professor Emeritus at the University of Cambridge)
By Paine, Thomas, Philp, Mark
By Sigmund Freud, Joyce Crick, Ritchie Robertson (Reader in German and Fellow, Reader in German and Fellow, St John's College, Oxford)
By David Hume, Peter Millican (Gilbert Ryle Fellow and Tutor in Philosophy, Hertford College, Oxford)
By William Paley, Matthew D. Eddy (Lecturer in the History and Philosophy of Science, University of Durham), David Knight (Professor of the History and Philosophy of Science