Combining Texts

You have chosen 'Are there propositions?' by Gilbert Ryle, 'Homeostasis, Species and Higher Taxa' by Richard Boyd and 'Sense Data and the Percept Theory' by Roderick Firth

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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