You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Theory of Knowledge (2nd edn)' by Keith Lehrer and 'The Barcan Formula and Metaphysics' by Ori Simchen
start again | choose another area for these texts | all the ideas for this combination of texts| All the ideas for Natural Theory, or select a subheading: |
| A. | Speculations on Nature | |
| B. | Natural Kinds | |
| C. | Causation | |
| D. | Laws of Nature |