‘The Hazards of Social Revolution’, in Aaron W. Warner, Dean Morse and Thomas E. Cooney (eds), The Environment of Change (New York and London, 1969: Columbia University Press), 1–27

• includes a short discussion between IB and I. I. Rabi on the rationality of science
• described as a ‘Summary of Remarks’, this text, under the title ‘The Lessons of History’, was in fact heavily corrected by IB before publication
• repr. with revisions as ‘The Lessons of History’ in Joshua L. Cherniss and Steven B. Smith (eds), The Cambridge Companion to Isaiah Berlin (New York, 2018: Cambridge University Press)