's term Force, so Motion is simpler in
conception than the rather vague and indefinite term Energy; therefore
when we say that all energy is energy of motion of some kind or sort, we
state that which is philosophically correct.

It is also in accord with the second Rule of Philosophy, in that it is
strictly in harmony with experience and observation. Look where we will,
or at what we will, there we find motion of some kind or other, whether
it be among the innumerable stars, or in our own solar system, or any
phenomena on the earth, or even among the world of atoms in their minute
and atomic systems. Such a thing as absolute rest, or stagnation, is
unknown in the universe. Wherever there is matter, there we find motion
of some kind or other. It may be vibratory motion as heat, or wave
motion as light, or rotatory motion as electricity, but motion of some
sort is inseparably connected with all matter. So that when we say that
all energy of the universe is the energy of motion, and motion only, we
state that which according to the second Rule of Philosophy is
absolutely correct.

Further, I wish to premise that by the use of the term modes of motion,
in lieu of energy, the third Rule of Philosophy will be fulfilled. For
if all phenomena of the universe, whether it be heat, light,
electricity, be due to different modes of motion, then Gravitation
should be explained from the physical standpoint by some kind of
aetherial motion also. This I can safely premise will be done, and in
the later chapters of this work, Gravitation will be shown to be due to
the motions of the aetherial medium which floods all space. By so doing,
all the Rules of Philosophy will be fully satisfied, and Gravitation
will then be brought into line with all the other forms of motion, as
heat, light, electricity, and magnetism, which are in themselves modes
of motion, as will be shown in subsequent articles.

ART. 57. _Conservation of Motion._--If it be true that all energy is the
energy of motion, then the principle of the conservation of energy ought
also to apply to all the modes of motion, and in its place we should
then have the principle of the conservation of the various forms of
motion. This defined would be, that the total amount of all motion in
the universe, as heat and light, electricity, magnetism, and Gravitation
also, if that be due to the motion of the Aether, is unalterable and
unchangeable.

There may be changes from one form of