The objector to this statement is himself violating the chief rule of all philosophy, in that he is going contrary to the tenor and teaching of his own experience. Then, following out the second rule step by step we arrive at the one grand central truth, that electricity is also a form of matter, and that all the forces of the entire universe are but different modes of motion, different vibrations of the universal electro-magnetic Aether; while all the varied bodies that exist are themselves but different manifestations in a gaseous, liquid, or solid form of the same electro-magnetic substance. Thus, step by step, we have tried to build up a theory of the physical cause of all phenomena, which will satisfactorily account for those phenomena, and even for the structure of the universe itself, from the mechanical standpoint, and by so doing have fulfilled the third Rule of our Philosophy as enunciated by Newton and others. So that by the conception that Aether is matter, in its primordial state, we have more than fulfilled all that was premised should be done. Thus the long-sought-for and long-expected cause of Gravitation, together with the cause of the two complementary forces, is found in the simple statement that Aether is matter, with all that is logically included therein. Kepler's Laws and Newton's Laws of Motion also receive a physical explanation in the same universal electro-magnetic Aether. In addition to the solution of these problems, the transverse vibrations of light has received for the first time a physical conception, and a physical explanation, even admitting that that explanation may not be perfect in detail. The origin of the permanent magnetism of the earth has also received a physical explanation through the motions of this same electro-magnetic Aether, while certain theories in relation to electricity given to the world by Ampère, Weber, Faraday, and Clerk Maxwell have found their consummation in this atomic electro-magnetic medium. Further, astronomical hypotheses in relation to comets and nebulae are not untouched by the theory of a compressible and condensing atomic Aether. Indeed, there is not a phase of natural phenomena which is not affected in some way or other by the philosophical result arrived at that Aether is matter in its original state. Therefore, we claim, however imperfectly it may have been done, that not only have the Rules of Philosophy been fulfilled, but that the theory so advanced has accomplished more than even we in our wildest imagination hoped and dreamed for it. Look at the problem of the Aether how we may, the advantages of the theory of an atomic electro-magnetic Aether far surpass and outweigh the advantages of a frictionless medium, which in some unknown way possesses mass and inertia, although the conception of such properties themselves disproves the existence of such a frictionless medium.