Combining Texts

You have chosen 'The Central Questions of Philosophy' by A.J. Ayer, 'Logic and Epistemology of Causal Relations' by G.H. von Wright and 'Rationality and Goodness' by Philippa Foot

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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