f Gravitational Matter in any part of the Universe"
(_Phil. Mag._, July 1902). So that if it be possible for Aether to be
condensed, and so form the nucleus of a planet or satellite, then,
seeing that the Aether is universal, any planet or satellite or meteor
may be formed in any part of the solar system; and the process has only
to be continued, until we have planets of various sizes at various
distances from the central body, the sun.

Here, therefore, at any rate, is a physical hypothesis which will
satisfactorily account for all the different distances of the various
planets. Apart from some such hypothesis, I fail to see how we can
account for the irregularity that exists between planetary distances,
when viewed from the standpoint of their masses and their densities.

Further, such a conception is entirely in harmony with the view of the
dual character of the motions or powers of the aetherial medium, that
would co-exist with the evolution and development of the planet. For, as
the planet was evolved and developed from the aetherial medium which
surrounded it on every side, two motions would be developed and grow
with it--the centrifugal force or motion, and the centripetal motion of
the Aether, or the attractive force known as Gravity. Thus, through all
the growth and development of a planet, these two powers, the
centripetal force and the centrifugal force, would be co-equal and
co-existent.

The same truth applies to the sun or any other body in the universe; so
that, if a planet, as the Earth, was formed in the beginning at its mean
distance of 92,700,000 miles, then the joint centripetal motions
produced by the Earth and sun in the Aether, would always equal the
joint centrifugal motions produced by the same two bodies, simply
because the two laws are the exact opposite of each other both in regard
to intensity, distance, and magnitude.

Thus the Earth would always occupy its relative position in relation to
the sun that it occupies to-day, as long as the two aetherial forces or
motions, the centripetal and the centrifugal, exist. With this brief
outline of a planet's history, we are now in a position to form a
physical picture of the solar system when it first existed in the
beginning.

We find the sun then occupying its centre. At various distances, we find
the various planets situated without any regard to their relative masses
or densities, as the following table shows. (The mass of sun is taken as