qually be shown that there were equipotential surfaces so far
as the phenomena of heat and light are concerned, as these also are
subject to the same laws. Having now very briefly considered the meaning
of the Electric Field, Electric Potential, Electric Density, and
Equipotential Surfaces, we are now in a position to apply these facts to
our solar system, at least as far as the sun is concerned.

In the foregoing Art. we arrived at the conclusion that the sun was an
electrified body, therefore, in accordance with all experiment and
observation, it, too, must have an electric field. Not only must it have
an electric field; but that field must possess different potentials,
possessing a higher potential the nearer the field gets to the sun, and
a lower potential the farther away the field is.

Further, around the sun there must also exist not imaginary but real
physical lines of force which indicate the electric and magnetic forces,
and which are made real by the atomic character of the Aether that
surrounds it; and those lines of force would be closer together the
nearer they got to the sun on account of the electric density of the
electric Aether, which coincides with the density of the Aether from the
gravitative standpoint. There would also be aetherial equipotential
spheres, or rather oblate spheroids around the sun, as the sun is not
strictly a sphere, its polar diameter being less than its equatorial
diameter.

[Illustration: Fig: 10.]

Let us therefore endeavour to picture the sun under these conditions as
the centre of our solar system. Let _S_ be the sun (Fig. 10), and the
lines _A_ _A'_, _B_ _B'_, _C_ _C'_, etc. represent Equipotential
Surfaces, Fig. 11 being a vertical section and Fig. 10 being an
equatorial section. In Fig. 11 the sections of the equipotential
surfaces would be vertical, while in Fig. 10 the sections of the
equipotential surfaces would be horizontal, while the electric lines
of force would be radial, as all electric radiations take place in
straight lines, as we shall see was proved by Hertz, later on. We
will suppose that the sun is stationary, as the question of the
movement of the sun, both axially and through space, will be
considered in a subsequent article.

[Illustration: Fig: 11.]

Then the question arises, How far does the sun's electric field extend?
That is rather a difficult question to answer, but the correct answer
would be, "As far as the sun's light extends, so far does