You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'Elements of Mathematical Logic' by Jan Lukasiewicz and 'New Essays on Human Understanding' 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 |