You have chosen 'On the Nature of the Gods ('De natura deorum')' by M. Tullius Cicero, 'Why Propositions cannot be concrete' by Alvin Plantinga and 'Intensions Revisited' by Willard Quine
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 |