You have chosen 'On Duties ('De Officiis')' by M. Tullius Cicero, 'Theory of Knowledge (2nd ed 1977)' by Roderick Chisholm and 'Lecture on Applicability of Mathematics' by Steven Weinberg
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 |