Combining Texts

You have chosen 'Theory of Science (4 vols)' by Bernard Bolzano, 'Apriority as an Evaluative Notion' by Hartry Field and 'Mind and Its Place in Nature' by C.D. Broad

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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