Introduction: George Molnar and Powers / Stephen Mumford -- Powers / George Molnar -- 1. The Elements (I): Properties -- 2. The Elements (II): On What There Is -- 3. Directedness -- 4. Independence -- 5. Actuality -- 6. Intrinsicality -- 7. Objectivity -- 8. Do Powers Need Grounds? -- 9. The Ontology of Powers -- 10. Non-Powers -- 11. Objections Considered -- 12. Powers at Work