Acknowledgements

The authors and publishers wish to thank the following for permission to use copyright material:

Princeton University Press for excerpts from The Collected Dialogues of Plato, eds E. Hamilton and H. Cairns (1961), renewed 1989 by Princeton University; Cambridge University Press for excerpts from The Philosophical Writings of Descartes, Vols I & II, eds J. Cottingham R. Stoothoff and D. Murdoch (1985), and The Philosophical Writings of Descartes, Vol III, & II, eds J. Cottingham, R. Stoothoff and D. Murdoch (1985), and The Philosophical Writings of Descartes, Vol III, eds. J. Cottingham, R. Stoothoff, D. Murdoch and A. Kenny (1991); Thomas Nelson & Sons for material from 'Essay Towards a New Theory of Vision', 'Principles of Human knowledge' and 'Manuscripts Introduction to Principles' from The Works of George Berkeley, eds A. A. Luce and T. E. Jessop (1948-57); Lawrence and Wishart for material from The German Idealogy, Karl Marx (1970) and Mark and Engels: Selected Works (1968), and International Publishers Co. Inc. for material from Capital, Karl Marx (1967); Routledge and Bertrand Peace Foundation for excerpts from Mysticism and Logic, Unwin Hyman (1976), Philosophy of Logical Atomism, Unwin Hyman (1976), Nightmares, Part 111, Unwin Hyman (1961) all by Bertrand Russell, and W. W. Norton, Inc. for excerpts from Principles of Mathematics, Bertrand Russell, 2nd edition, Alien & Unwin (1985); Blackwell Publishers for excerpts from Philosophical Investigations, Ludwig Wittgenstein, 3rd edition (1967), and The Blue and Brown Books, Ludwig Wittgenstein (1958); The Estate of Karl Popper for material from The Poverty of Historicism, Karl Popper, Routledge (1960); the Turing estate for quotation of passages from Turing's unpublished writings, the London Mathematical Society for extracts from his papers of 1936 and 1939, the Controller of HMSO for reports from the National Physical Laboratory, 1946 and 1948 (Crown copyright), Oxford University Press for extracts from the Mind articles of 1950, Harvester Wheatsheaf for reproduction of the Turing-Wittgenstein dialogue.

Every effort has been made to trace the copyright holders but if any have been inadvertently overlooked the publishers will be pleased to make the necessary arrangement at the first opportunity.

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