INDEX OF CHAPTERS.
| Chap. 12. | The Magnetick Horizon. | |
| Chap. 13. | On the Axis and Magnetick Poles. | |
| Chap. 14. | Why at the Pole itself the Coition is stronger than in the other parts intermediate between the æquator and the pole; and on the proportion of forces of the coition in various parts of the earth and of the terrella. | |
| Chap. 15. | The Magnetick Virtue which is conceived in Iron is more apparent in an iron rod than in a piece of Iron that is round, square, or of other figure. | |
| Chap. 16. | Showing that Movements take place by the Magnetical Vigour though solid bodies lie between; and on the interposition of iron plates. | |
| Chap. 17. | On the Iron Cap of a Loadstone, with which it is armed at the pole (for the sake of the virtue), and on the efficacy of the same. | |
| Chap. 18. | An armed Loadstone does not indue an excited piece of Iron with greater vigour than an unarmed. | |
| Chap. 19. | Union with an armed Loadstone is stronger; hence greater weights are raised; but the coition is not stronger, but generally weaker. | |
| Chap. 20. | An armed Loadstone raises an armed Loadstone, which also attracts a third; which likewise happens, though the virtue in the first be somewhat small. | |
| Chap. 21. | If Paper or any other Medium be interposed, an armed loadstone raises no more than an unarmed one. | |
| Chap. 22. | That an armed Loadstone draws Iron no more than an unarmed one: and that an armed one is more strongly united to iron is shown by means of an armed loadstone and a polished Cylinder of iron. | |
| Chap. 23. | The Magnetick Force causes motion toward unity, and binds firmly together bodies which are united. | |
| Chap. 24. | A piece of Iron placed within the Orbe of a Loadstone hangs suspended in the air, if on account of some impediment it cannot approach it. | |
| Chap. 25. | Exaltation of the power of the magnet. | |
| Chap. 26. | Why there should appear to be a greater love between iron & loadstone, than between loadstone & loadstone, or between iron & iron, when close to the loadstone, within its orbe of virtue. | |
| Chap. 27. | The Centre of the Magnetick Virtues in the earth is the centre of the earth; and in a terrella is the centre of the stone. | |
| Chap. 28. | A Loadstone attracts magneticks not only to a fixed point or pole, but to every part of a terrella save the æquinoctial zone. | |
| Chap. 29. | On Variety of Strength due to Quantity or Mass. | |
| Chap. 30. | The Shape and Mass of the Iron are of most importance in cases of coition. | |
| Chap. 31. | On long and round stones. | |
| Chap. 32. | Certain Problems and Magnetick Experiments about the Coition, and Separation, and regular Motion of Bodies magnetical. | |
| Chap. 33. | On the Varying Ratio of Strength, and of the Motion of coition, within the orbe of virtue. | |
| Chap. 34. | Why a Loadstone should be stronger in its poles in a different ratio; as well in the Northern regions as in the Southern. | |
| Chap. 35. | On a Perpetual Motion Machine, mentioned by authors, by means of the attraction of a loadstone. |
Chap.
