Combining Texts

You have chosen 'Letters to Antoine Arnauld' by Gottfried Leibniz, 'The Logical Structure of the World (Aufbau)' by Rudolph Carnap and 'Quaestiones de anima' by Thomas Aquinas

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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