You have chosen 'Perpetual Peace' by Immanuel Kant, 'Fourfold Root of Princ of Sufficient Reason' by Arthur Schopenhauer and 'Difficulties of Transfinite Numbers and Types' 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 |