ar of iron or steel, as described
in Mr. Cavallo's valuable Treatise on Magnetism; the arctic ether of
the north pole of the magnetic bar attracts the antarctic ether of the
bar of common iron towards the end in contact, and repels the arctic
ether; but, as iron and steel are as bad conductors of magnetism, as
glass is of electricity, this accumulation of arctic ether extends but
a little way, and then there exists an accumulation of antarctic
ether; and thus reciprocally in three or four divisions of the bar,
which now becomes magnetised, as the glass tube became electrised.

Another striking feature, which shows the sisterhood of electricity
and magnetism, consists in the origin of both of them from the earth,
or common mass of matter. The eduction of electricity from the earth
is shown by an insulated cushion soon ceasing to supply either the
vitreous or resinous ether to the whirling globe of glass or of
sulphur; the eduction of magnetism from the earth appears from the
following experiment: if a bar of iron be set upright on the earth in
this part of the world, it becomes in a short time magnetical; the
lower end possessing northern polarity, or arctic ether, and the
higher end in consequence possessing southern polarity or antarctic
ether; which may be well explained, if we suppose with Mr. Cavallo,
that the earth itself is one great magnet, with its southern polarity
or antarctic ether at the northern end of its axis; and, in
consequence, that it attracts the arctic ether of the iron bar into
that end of it which touches the earth, and repels the antarctic ether
of the iron bar to the other end of it, exactly the same as when the
southern pole of an artificial magnet is brought into contact with one
end of a sewing needle.

3. The magnetic and electric ethers agree in the characters above
mentioned, and perhaps in many others, but differ in the following
ones. The electric ethers pass readily through metallic, aqueous, and
carbonic bodies, but do not permeate vitreous or resinous ones; though
on the surfaces of these they are capable of adhering, and of being
accumulated by the approach or contact of other bodies; while the
magnetic ethers will not permeate any bodies, and are capable of being
accumulated only on iron and steel by the approach or contact of
natural or artificial magnets, or of the earth; at the same time the
attractive and repulsive powers both of the magnetic and electric
ethers will act throu