You have chosen 'Theory of Science (4 vols)' by Bernard Bolzano, 'On the Conservation of Force' by Hermann von Helmholtz and 'Philosophy of Science' by Alexander Bird
start again | choose another area for these texts | all the ideas for this combination of texts| All the ideas for Existence, or select a subheading: |
| A. | Nature of Existence | |
| B. | Change in Existence | |
| C. | Structure of Existence | |
| D. | Theories of Reality | |
| E. | Categories |