g in its magnetical actions as C D or D E, if torn
away from the whole in equal quantity. For no part excels in special worth
in the whole mass except by what is owing to the other adjoining parts by
which an absolute and perfect whole is attained.

_Diagram of Magnetic Vigour
transmitted from the plane of the Aequator
to the peripherery of the terella
or of the earth_

[Illustration]

{75} HEQ is a terrella, E a pole, M the centre, HMQ the aequinoctial plane.
From every point of the aequinoctial plane vigour extends to the periphery,
but by various methods; for from A the formal force is transmitted towards
C, F, N, E, and to every point from C up to E, the pole; but not towards B;
so neither from G towards C. The power of alluring is not strengthened in
the part FHG from that which is in GMFE, but FGH increases the force in the
eminence FE. So no force rises from the internal parts, from the lines
parallel to the Axis above those parallels, but always inwards from the
parallels to the pole. From every point of the plane of the equator force
proceeds to the pole E, but the point F has its powers only from GH, and N
from OH; but the pole E is strengthened from the whole plane HQ. Wherefore
in it the mighty power excels (just as in a palace); but in the
intermediate intervals (as in F) only so much force of alluring is exerted
as the portion HG of the plane can contribute.

* * * * *

CHAP. VI.

How magnetick pieces of Iron and smaller
_loadstones conform themselves to a terrella & to_
the earth itself, and by them are
_disposed_.

Coition of those bodies which are divided, and do not naturally cohaere, if
they are free, occurs through another kind of motion. A terrella sends out
in an orbe its powers in proportion to its vigour and quality. But when
iron or any other magnetick of convenient magnitude comes within its orbe
of virtue, it is allured; but the nearer it comes to the body, the more
quickly it runs up to it. They move towards the magnet, not as * to a
centre, nor towards its centre. For they only do this in the case of the
poles themselves, when namely that which is being allured, and the pole of
the loadstone, and its centre, are in the same straight line. But in the
intervening spaces they tend obliquely, just as is evident in the following
figure, in which it is shown how the influence is extended to the adjoining
magneticks within the orbe; in the case of the pole