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7. Things fall not to the earth because of the magnetism therein, save as hereinafter mentioned, but they are driven toward the centre of the vortex, by the power of the vortex.
8. The greater diameter of the vortex is east and west; the lesser diameter north and south, with an inclination and oscillation relatively like the earth.
9. The name of the force of the vortex is called vortexya, that is, positive force, because it is arbitrary and exerteth east and west. As in the case of a wheel turning on its axis, its force will be at right angles with its axis, the extreme centre of which will be no force.
10. For which reason the north and south line of the earth's vortex is called the m'vortexya, or negative force, for it is the subject of the other. As a whirlwind gathereth up straw and dust, which travel toward the centre of the whirlwind, and to the poles thereof, even so do corporeal substances incline to approach the poles of the earth's vortex. Which may be proved by poising a magnetized needle.