You have chosen 'The Sign of Four' by Arthur Conan Doyle, 'The Meaning of 'Meaning'' by Hilary Putnam and 'On the Syllogism IV' by Augustus De Morgan
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 |