Combining Texts

You have chosen 'Foundations of Geometry' by David Hilbert, 'Rules for the Direction of the Mind' by Ren Descartes and 'In Defense of Absolute Essentialism' by Graeme Forbes

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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