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 retain the electric conception of space and matter, and do away with the aetherial, as being altogether unnecessary. See _Appendix B_. Thus are we led to the conclusion that electricity is itself a form of matter, as indeed it must be if it is atomic, as suggested by Dr. Larmor and Professor Thomson. Professor Lodge, on p. 9 of the work already referred to, states: "Electricity in this respect behaves just like a substance;" and again, p. 313, he writes: "We cannot assert that it is a form of matter, neither can we deny it; on the other hand, we certainly cannot assert that it is a form of energy, and I should be disposed to deny it. It may be that electricity is an _entity per se, just as matter is an entity per se_."