Combining Texts

You have chosen 'The Birth of Tragedy' by Friedrich Nietzsche, 'The Spirit of the Laws (rev. 1757)' by Baron de Montesquieu and 'Reply to Fourth Objections' by Ren Descartes

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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