Knowledge of Metaphysical Modality

Dave Chalmers points out that Timothy Williamson's book manuscript, The Philosophy of Philosophy is online. Chapter 2 is about the methodology of the vagueness debate and of analytic philosophy more generally. Chapter 5, Knowledge of Metaphysical Modality, also looks particularly interesting. Its conclusion is that the epistemology of metaphysical modality is a special case of counterfactual thinking about the spatio-temporal world.