Combining Texts

You have chosen 'Precepts for Advancing Science and Arts' by Gottfried Leibniz, 'Laws in Nature' by Stephen Mumford and 'The Aim and Structure of Physical Theory' by Pierre Duhem

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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