For example, let _A_ and _C_ be the same brass balls with the particles of air between them, _A_ being the positively charged ball and _C_ the unelectrified ball, the shaded parts representing positive electricity and the unshaded parts negative electricity. Then _A_ will act inductively on the unelectrified ball _C_ through the medium of the particles of air _d_, _e_, _f_, _g_, _h_. The electrified ball _A_ will act first on the layer of particles next to it, attracting their negative electricity and repelling the positive according to the well-known law that "Unlike electricities attract, like electricities repel each other." The positive electricity in the first layer then acts in the particles of the next layer in the same way, and thus the inductive action is transmitted through the particles, from layer to layer, until we come to the last layer of particles next to the ball _C_. As the half of each atom or particle nearest to _C_ is positively electrified, then the half of the ball _C_ nearest to the layer becomes negatively electrified, while the half further away is positively electrified. Thus we say that _C_ has become electrified by induction through the polarization of the particles of air which lie between the two bodies. Faraday on this point says: "Thus induction appears to be essentially an action of contiguous particles, through the intermediations of which the Electric Force, originating at a certain place, is propagated or sustained at a distance, appearing there as a Force of the same kind exactly equal in amount, but opposite in its direction and tendencies."[28] While again he states:[29] "Induction appears to consist in a certain polarized state of particles into which they are thrown by the electrified body sustaining the action, the particles assuming positive and negative parts which are symmetrically the lines of Inductive Force." Thus in the case of any electrified body, acting on an unelectrified body at a distance, it has to be definitely understood that _the action at a distance_ is alone communicated and propagated by the dielectric or medium which exists between the two bodies. Though in the case of Gravitation it has been mathematically assumed, that action at a distance is possible, yet experimentally and physically such an assumption is philosophically incorrect, as all experience and experiment go to prove that there is no such thing as action at a distance manifested, except such action is propagated through the intervening medium, as stated and proved by Faraday. In order to bring Gravitation, therefore, into line with our experience, it will have to be demonstrated that it, too, is the result of the action of the intervening medium, that is, the Aether, which is a result we are being led up to.