Combining Texts

You have chosen 'What is the Basis of Moral Obligation?' by H.A. Prichard, 'De arcanus motus' by Gottfried Leibniz and 'The Principles of Art' by R.G. Collingwood

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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