You have chosen 'On Sense and Reference' by Gottlob Frege, 'Reply to Professor Frankena' by Philippa Foot and 'Sameness and Substance Renewed' by David Wiggins
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 |