You have chosen 'Concerning the Author' by Charles Sanders Peirce, 'The Problem of the Essential Indexical' by John Perry and 'Introduction of 'Essence of Christianity'' by Ludwig Feuerbach
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 |