8. A Matter of Debate: Conceptions of Material Substance in the Scientific Revolution -- 9. War of the Worlds: Cartesian Vortices and Newtonian Gravitation in Eighteenth-Century Astronomy -- 10. Historical Pyrrhonism and Its Discontents -- Conclusion -- Notes -- Bibliography -- Index -- A -- B -- C -- D -- E -- F -- G -- H -- I -- J -- K -- L -- M -- N -- O -- P -- R -- S -- T -- U -- V -- W -- Y -- Z