Combining Texts

You have chosen 'A Discourse on Method' by René Descartes, 'Metaphysical Foundations of Mathematics' by Gottfried Leibniz and 'There are no ordinary things' by Peter Unger

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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