You have chosen 'What is Property?' by Pierre-Joseph Proudhon, 'What is an Idea?' by Gottfried Leibniz and 'When Does a Life Begin?' by Michael Lockwood
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 |