Combining Texts

You have chosen 'Principles of Philosophy' by René Descartes, 'The Limits of Reason' by Tim Button and 'The Concept of Truth for Formalized Languages' by Alfred Tarski

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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