Preface -- Part 1: History and its modes. Unity and diversity in historical studies ; Varieties of structure in historical accounts -- Part 2: Causation. Causal beliefs in everyday life ; Causes, necessity, and laws ; On what and why in history -- Part 3: Objectivity. Objectivity and its limits ; Objectivity, causation, and laws -- Appendix A: Hume -- Appendix B: Hart and Honore.