Combining Texts

You have chosen 'New System and Explanation of New System' by Gottfried Leibniz, 'Concepts without Boundaries' by Mark Sainsbury and 'Reply to Professor Marcus' by Willard Quine

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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