Combining Texts

You have chosen 'Nature and Observability of Causal Relations' by Curt Ducasse, 'On Body and Force, Against the Cartesians' by Gottfried Leibniz and 'On Medical Experience' by Galen

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All the ideas for Science, or select a subheading:
      A. Basis of Science
      B. Scientific Theories
      C. Induction
      D. Explanation