Combining Texts

You have chosen 'The Evolution of Logic' by William D. Hart, 'Fact, Fiction and Forecast (4th ed)' by Nelson Goodman and 'Against the Mathematicians' by Sextus Empiricus

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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