Introduction : a voyage of exploration -- The British Committee on the Theory of International Politics -- Martin Wight and the theory of international relations -- Hedley Bull, states systems and international societies -- The Anarchical Society in the history of international relations : discussions with Hedley Bull -- Justice between states -- The prospects for a more integrated international society -- "The practice outruns the theory" -- The future of the Westphalian anti-hegemonial international system -- International relations and the practice of hegemony -- The changing international system -- 1878 : a case study in collective hegemony -- Hegemony & history.