Combining Texts

You have chosen 'works' by Aristotle, 'What is the Source of Knowledge of Modal Truths?' by E.J. Lowe and 'On the Conservation of Force' by Hermann von Helmholtz

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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