Combining Texts

You have chosen 'Letter to Mersenne' by René Descartes, 'Review of 'The Price is Wrong' by B.Christophers' by William Davies and 'De modo distinguendi phaenomena' by Gottfried Leibniz

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All the ideas for Thought, or select a subheading:
      A. Modes of Thought
      B. Mechanics of Thought
      C. Content
      D. Concepts
      E. Abstraction