You have chosen 'On the Syllogism IV' by Augustus De Morgan, 'Phil of Mathematics and Natural Science' by Hermann Weyl and 'Types and Ontology' by Fred Sommers
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 |