iagram of declinations of the magnetick needle, when excited, in
the various positions of the sphere, and horizons of the earth, in which
there is no variation of the declination.

Chap. 3. An indicatory instrument, showing by the virtue of a stone the
degrees of declination from the horizon of each several latitude.

Chap. 4. Concerning the length of a versorium convenient for declination on
a terrella.

Chap. 5. That declination does not arise from the attraction of the
loadstone, but from a disposing and rotating influence.

Chap. 6. On the proportion of declination to latitude, and the cause of it.

Chap. 7. Explanation of the diagram of the rotation of a magnetick needle.

Chap. 8. Diagram of the rotation of a magnetick needle, indicating
magnetical declination in all latitudes, and from the rotation and
declination, the latitude itself.

Chap. 9. Demonstration of direction, or of variation from the true
direction, at the same time with declination, by means of only a single
motion in water, due to the disposing and rotating virtue.

Chap. 10. On the variation of the declination.

Chap. 11. On the essential magnetick activity sphaerically effused.

Chap. 12. Magnetick force is animate, or imitates life; and in many things
surpasses human life, while this is bound up in the organick body.

_Book 6._

Chap. 1. On the globe of the earth, the great magnet.

Chap. 2. The Magnetick axis of the Earth persists invariable.

Chap. 3. On the magnetick diurnal revolution of the Earth's globe, as a
probable assertion against the time-honoured opinion of a Primum Mobile.

Chap. 4. That the Earth moves circularly.

Chap. 5. Arguments of those denying the Earth's motion, and their
confutation.

Chap. 6. On the cause of the definite time of an entire rotation of the
Earth.

Chap. 7. On the primary magnetick nature of the Earth, whereby its poles
are parted from the poles of the Ecliptick.

Chap. 8. On the Praecession of the Aequinoxes, from the magnetick motion of
the poles of the Earth, in the Arctick & Antarctick circle of the Zodiack.

Chap. 9. On the anomaly of the Praecession of the Aequinoxes, & of the
obliquity of the Zodiack.

[Illustration]

* * * * *

{1} [Illustration]

WILLIAM GILBERT

ON THE LOADSTONE, BK. I.

_CHAP. I._

ANCIENT AND MODERN WRITINGS
on the Loadstone, with certain matters of mention only,
_various opinions, & vanities_.

At an earl