Combining Texts

You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Political Liberalism' by John Rawls and 'Rules for the Direction of the Mind' by Ren Descartes

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All the ideas for Natural Theory, or select a subheading:
      A. Speculations on Nature
      B. Natural Kinds
      C. Causation
      D. Laws of Nature