Combining Texts

You have chosen 'Presidential Address of Am. Math. Soc' by Oswald Veblen, 'On What There Is' by Willard Quine and 'Essence and Accident' by Irving M. Copi

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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