You have chosen 'The Evolution of Logic' by William D. Hart, 'Varieties of Things' by Cynthia Macdonald and 'The Tragic Sense of Life' by Miguel de Unamuno
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 |