Combining Texts

You have chosen 'Quodlibeta' by Thomas Aquinas, 'Letter to G.H. Schaller' by Baruch de Spinoza and 'Philosophy of Logics' by Susan Haack

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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