You have chosen 'On the Nature of the Universe' by Lucretius, 'The Life of Reason' by George Santayana and 'The soul's dependence on the body' by Galen
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 |