You have chosen 'Introduction to 'Hippias Minor'' by Robin Waterfield, 'On the Conservation of Force' by Hermann von Helmholtz and 'Letters to Samuel Masson' by Gottfried Leibniz
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| A. | Modes of Thought | |
| B. | Mechanics of Thought | |
| C. | Content | |
| D. | Concepts | |
| E. | Abstraction |