You have chosen 'Rules for the Direction of the Mind' by René Descartes, 'On the Plurality of Worlds' by David Lewis and 'Papers of 1913' by Bertrand Russell
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 |