hesis we ought also to find a repulsive
power in light. From the dynamical aspect of light on the bases of facts
given to the world by such men as Professor Stokes, Clerk Maxwell, Lord
Kelvin, and Professor Lebedew, we are compelled, therefore, to come to
the conclusion that light does possess such a repulsive force, such
force being due to the dynamical action of the aetherial light waves.

Thus we learn from the dynamical action of light, that not only is the
sun the centre of an attractive force, but that it is equally the centre
of a repellent or repulsive power or motion; which repulsive power
always follows the path of the radius vector, and diminishes with an
intensity which is inversely as the square of the distance. What we have
to ask ourselves therefore is, whether the repulsive power of light is
the Centrifugal Force that we are trying to discover? In Art. 24 we
found out what were the necessary characteristics of the Centrifugal
Force, which is to form the companion law to the attractive law of
gravity, or the Centripetal Force. We there saw that this centrifugal
law must be universal in character; that it must coincide with the path
of the centripetal force; that it must also be subject to the same law
of intensity, viz. the law of inverse squares; and further, that the
force must be proportional to the product of the two masses concerned.
We find in the repulsive power of light three at any rate of these
conditions fulfilled. Light is universal because Aether is universal.
It is always subject to the law of inverse squares, and what is more,
its repelling power coincides exactly with the path which the
centripetal force takes, that is, the radius vector. We have not,
however, discovered that light fulfils the remaining necessary
condition, which is, that the repelling powers of light emitted by any
two bodies are equal to the product of their masses. So that until this
is done, it cannot be said that the aetherial light waves form the
centrifugal force or motion from a central body that we are seeking for.
But while that may be true, yet if light be not the centrifugal motion,
it certainly indicates in what direction we are to look for that force,
and that is to the Aether, whose periodic waves give rise to the
phenomena of light. For, after all, light is due to aetherial wave
motion, and, therefore, while light from certain standpoints may be
conceived to be the cause of other phenomena, yet primarily the