as it
is moved by the aetherial displacement belonging to the radiation,
resists with its own definite inertia."

Apart from this evidence, the philosophical evidence already adduced in
Chapter X. is altogether in favour of the fact that electricity
possesses inertia. So that we may say that, though the evidence as to
the identity of electrical and aetherial inertia is not fully complete,
the balance of opinion lies in favour of the identity rather than
otherwise. See _Appendix A_.

It can further be demonstrated that electricity possesses elasticity the
same as the Aether does. The charge and discharge of a Leyden jar are
conclusive evidence of the elasticity associated with electrical
phenomena, while further proof is to be found in the fact that Dr.
Larmor attributes elasticity to his electrons, such elasticity being of
a rotational type.

The identity, therefore, that exists between Aether is now almost
complete. We have now only to prove that both are compressible, and the
identity is fully established. This will be done by reference to certain
of Faraday's experiments before the conclusion of this article. As we
have established, logically, the identity that exists between Aether and
electricity, the question arises now as to whether they are not one and
the same medium. If they are not one and the same medium, then we are in
the distinctly unphilosophical position of having to admit that all
interplanetary and interstellar space are filled at one and the same
time by two different media, and such an assumption is directly opposed
to all observation and experience.

Therefore, to be strictly philosophical, one of these media must be done
away with, and we may either assert that interplanetary and interstellar
space is filled with electricity, or else it is filled with Aether, as
it is much simpler to conceive of space being filled with one medium,
than it is to suppose it to be filled with two media, which are
absolutely identical in all their characteristic properties and
functions. Both can give rise to exactly the same kind of phenomena,
whether they are the phenomena of heat, light, electricity, or
magnetism, and even gravitation itself. So that, if Science wishes to be
distinctly philosophical in her statements in future, it will be
necessary, it seems to me, to do away either with the Aether, or with
the electricity, and as the latter is the better known entity, I am of
the opinion that Science will re