You have chosen 'The Evolution of Logic' by William D. Hart, 'Fourfold Root of Princ of Sufficient Reason' by Arthur Schopenhauer and 'On the True Doctrine (Against Christians)' by Celsus
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 |