You have chosen 'On the Happy Life' by Seneca the Younger, 'The Conquest of Happiness' by Bertrand Russell and 'True Method in Philosophy and Theology' by Gottfried Leibniz
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 |