Darwin and the Nature of Species -- Contents -- Preface -- Acknowledgments -- 1. A History of Nominalist Interpretation -- 2. Taxon, Category, and Laws of Nature -- 3. The Horizontal/Vertical Distinction and the Language Analogy -- 4. Common Descent and Natural Classification -- 5. Natural Selection and the Unity of Science -- 6. Not Sterility, Fertility, or Niches -- 7. The Varieties Problem -- 8. Darwin's Strategy -- 9. Concept Change in Scientific Revolutions -- 10. Darwin and the New Historiography -- Notes -- References -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- Q -- R -- S -- T -- U -- V -- W.