You have chosen 'Abstract of 'The Fourfold Root'' by Arthur Schopenhauer, 'Theses on Feuerbach' by Karl Marx and 'An Inquiry into Meaning and Truth' 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 |