Combining Texts

You have chosen 'Reply to Fourth Objections' by René Descartes, 'True in Theory, but not in Practice' by Immanuel Kant and 'What Required for Foundation for Maths?' by John Mayberry

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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