Combining Texts

You have chosen 'What is so bad about Contradictions?' by Graham Priest, 'Process and Reality' by Alfred North Whitehead and 'Theory of Knowledge (2nd edn)' by Keith Lehrer

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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