Combining Texts

You have chosen 'Symbolic Reasoning' by Hugh MacColl, 'Regressive Method for Premises in Mathematics' by Bertrand Russell and 'The Nature of Universals and Propositions' by G.F. Stout

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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