motion to another, from heat to
light, and light back to heat; heat into electricity, and electricity
into light or heat; from Gravitation into heat or into light, or even
into electricity; but the sum-total of the whole remains the same.

Again, as the principle of the conservation of energy is inseparably
connected with the conservation of matter, so the principle of the
conservation of all the modes of motion is also inseparably connected
with the conservation of matter. They cannot be divided, so that
wherever we get matter of any kind or sort, there we get motion of some
kind, either in the form of heat, light, or electricity, or those
aetherial motions which produce those phenomena associated with
Gravitation.

As matter cannot be destroyed by any known process to man, so motion
cannot be destroyed either. On the vortex atom theory of matter, this
principle of the conservation of any mode of motion is perfectly
intelligible, especially if added to that theory we have Dr. Larmor's
electron theory as the basis of the vortex atom. An atom in its ultimate
state is nothing more or less than Aether in rotation, and as Aether is
matter, we see that on the assumption of this atomic basis, we have even
in the atomic world an illustration of this conservation of matter and
motion, as in such an atom we have nothing but matter (_i. e._ Aether)
and motion. Carrying the idea upwards in the atomic scale, if atoms of
hydrogen or oxygen are multiples of these vortex atoms, then again we
have nothing in all the elements, or combination of the elements, but
matter and motion. Again, as all planets and satellites, suns and stars,
are but agglomerations of elements, we have still the same two classes
of things, matter and motion, and so from the most infinitesimal atom in
existence, up to the most ponderous star that exists in the universe, we
have running through them all the principle of the conservation of
motion, which is to matter the source of all its activities, energies,
and powers. Motion, therefore, might almost be said to be eternal. We
have heard from time to time of the term perpetual motion. Philosophers
have from time to time endeavoured to discover some application of this
perpetual motion, but all efforts in this direction up to the present
have proved futile. In one sense there is no such thing as perpetual
motion. In another sense, that is from the standpoint of the
conservation of all modes of motion, as motion c