George Molnar came to see that the solution to a number of the problems in contemporary philosophy lay in the development of an alternative to Hume's metaphysics, with real causal powers at its center. Molnar's eagerly anticipated book setting out his theory of powers was almost complete when he died, and has been prepared for publication by Stephen Mumford, who provides a context-setting introduction.

George Molnar came to see that the solution to a number of the problems of contemporary philosophy lay in the development of an alternative to Hume's metaphysics. This alternative would have real causal powers at its centre. Molnar set about developing a thorough account of powers that might persuade those who remained, perhaps unknowingly, in the grip of Humean assumptions. He succeeded in producing something both highly focused and at the same time wide-ranging. He showed both that the notion of a power was central and that it could serve to dispel a number of long-standing philosophical...