Combining Texts

You have chosen 'Opus Maius (major works)' by Roger Bacon, 'On the Law of War' by Francis de Vitoria and 'The Methods of Ethics (7th edn)' by Henry Sidgwick

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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