Combining Texts

You have chosen 'Natural Kinds and Biological Realism' by Michael Devitt, 'On Duties ('De Officiis')' by M. Tullius Cicero and 'A Theory of Universals' by David M. Armstrong

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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