Combining Texts

You have chosen 'Replies on 'Limits of Abstraction'' by Kit Fine, 'Letters to Wolff' by Gottfried Leibniz and 'Principles of Philosophy of the Future' by Ludwig Feuerbach

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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