Introduction; What Rules Amount to in Practice: A Theory with a Definition; Logical Preliminaries to a Formal Theory of Rules; The Logic of Rules; Who Controls the Marriage Decision? Stone and Macfarlane: Opposed Accounts; Marx and Macfarlane: On Peasant and Capitalist Ownership in England; Justice in hte Marxist Dialectic of Rules; A Rules-Analysis, Following Foucault, of the Birth of Clinical Medicine; The Opposition, Intended or Real, of the US Constitution to Factions or Political Parties; The Abolition of the British Slave Trade; Logic and its Application to Social Change: Our Work in Retrospect and Prospect