You have chosen 'Reply to Fourth Objections' by René Descartes, 'Difficulties of Transfinite Numbers and Types' by Bertrand Russell and 'Real Natures and Familiar Objects' by Crawford L. Elder
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 |