Combining Texts

You have chosen 'Letters to Samuel Masson' by Gottfried Leibniz, 'Open Society and Its Enemies:Hegel and Marx' by Karl Popper and 'Foundations of Two-Dimensional Semantics' by David J.Chalmers

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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