Combining Texts

You have chosen 'Conspectus libelli (book outline)' by Gottfried Leibniz, 'De modo distinguendi phaenomena' by Gottfried Leibniz and 'Remarks on the forces of inorganic Nature' by J.R. Mayer

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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