On the Magnet

Chap. 12. The magnetic horizon.
Chap. 13. Of the magnetic axis and poles.
Chap. 14. Why coition is stronger at the pole itself than in other parts between the equator and the pole; and of the proportion of the forces of coition in different parts of the Earth and the terrella.
Chap. 15. Magnetic virtue conceived in iron appears more in an iron rod than in round, square, or other shapes of iron tools.
Chap. 16. That motions are made by magnetic vigor through intervening solid bodies, and of the interposition of an iron plate.
Chap. 17. Of the iron helmet of the magnet, by which it is armed over the pole (for the sake of virtue); and its efficiency.
Chap. 18. An armed magnet does not imbue excited iron with greater vigor than an unarmed one.
Chap. 19. With an armed magnet, the union is stronger: hence heavier weights are lifted; but the coition is not stronger, and is generally weaker.
Chap. 20. An armed magnet lifts an armed magnet, which also carries a third; which is the same even if there was less virtue in the first.
Chap. 21. With paper or another medium interposed, an armed magnet does not lift more than an unarmed one.
Chap. 22. That an armed magnet does not pull iron more than an unarmed one; and that it is united to iron more strongly when armed is shown by an armed magnet and a polished iron cylinder.
Chap. 23. Magnetic force makes motion toward unity, and firmly connects things once united.
Chap. 24. Iron placed within the sphere of the magnet hangs suspended in the air if it cannot approach due to an obstacle.
Chap. 25. The exaltation of the magnet's virtues.
Chap. 26. Why the love of iron and the magnet appears greater than that of a magnet with a magnet, or of iron with iron, near the magnet within the sphere of virtue.
Chap. 27. The center of magnetic virtues in the Earth is the center of the Earth. And in the terrella, the center of the stone.
Chap. 28. A magnet does not allure magnetic bodies to a fixed point or pole only; but to every part of the terrella except the equinoctial belt.
Chap. 29. Of the variety of powers due to quantity or mass.
Chap. 30. The figure and mass of iron are very important in coitions.
Chap. 31. Of a long and a round stone.
Chap. 32. Certain magnetic problems and experiments concerning coition, separation, and the rightful motion of magnetic bodies.
Chap. 33. Of the different reason for strength and the motion of coition within the sphere of virtue.
Chap. 34. Why a magnet is stronger in its poles for different reasons: both in Northern and Southern regions.
Chap. 35. Of the instrument of perpetual motion commemorated by authors, through the attraction of a magnet.
Chap. 36. How a stronger magnet is recognized.
Chap. 37. The use of the magnet in that it affects iron.
Chap. 38. Of the attractions of other bodies.
Chap. 39. Of bodies mutually repelling each other.