Combining Texts

You have chosen 'Philosophical Explanations' by Robert Nozick, 'Il Saggiatore ('The Assayer')' by Galileo Galilei and 'Principles of Theoretical Logic' by Hilbert,D/Ackermann,W

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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