Combining Texts

You have chosen 'The Courtier and the Heretic' by Matthew Stewart, 'Presidential Address of Am. Math. Soc' by Oswald Veblen and 'Letters to Foucher' by Gottfried Leibniz

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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