Combining Texts

You have chosen 'A Plea for Excuses' by J.L. Austin, 'Letters to Burcher De Volder' by Gottfried Leibniz and 'Principles of Theoretical Logic' by Hilbert,D/Ackermann,W

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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