Combining Texts

You have chosen 'Natural Science (lost)' by Metrodorus (Chi), 'Letters to Thomas Burnett' by Gottfried Leibniz and 'Contrib to Critique of Hegel's Phil of Right' by Karl Marx

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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