Combining Texts

You have chosen 'On Body and Force, Against the Cartesians' by Gottfried Leibniz, 'The Methods of Ethics (7th edn)' by Henry Sidgwick and 'Critique of Practical Reason' by Immanuel Kant

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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