1. Propositions 1-8. On magnitudes, their multiples and their measures; 2. Propositions 9-12. Commensurable magnitudes; 3. Propositions 13, 14. On ratio; 4. Propositions 15-26. The simpler propositions in the theory of ratios with geometrical applications; 5. Propositions 27-34. Similar figures; 6. Propositions 35, 36. Miscellaneous propositions; 7. Proposition 37. An important proposition in the theory of ratio; 8. Propositions 38-50. On areas; 9. Propositions 51-56. Miscellaneous geometrical propositions; 10. Propositions 57-64. The remaining important theorems in the theory of ratio; 11. Propositions 65, 66. Other propositions in the theory of ratio.
