Combining Texts

You have chosen 'Critique of the Gotha Program' by Karl Marx, 'On Nature Itself (De Ipsa Natura)' by Gottfried Leibniz and 'The Principles of Chemistry' by Dmitri Mendeleev

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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