Combining Texts

You have chosen 'A Conversation: what is it? What is it for?st1=Gilles Deleuze' by , 'works' by G.E. Moore and 'Presidential Address of Am. Math. Soc' by Oswald Veblen

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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