You have chosen 'On the Conservation of Force' by Hermann von Helmholtz, 'Title, Unity, Authenticity of the 'Categories'' by Michael Frede and 'Phenomenal and Perceptual Concepts' by David Papineau
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 |