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as the displacement is increasing or decreasing. In the interior of the dielectric there is no indication of electrification, because the electrification of the surface of any molecule is neutralized by the opposite electrification of the surface of the molecules in contact with it; but at the bounding surface of the dielectric, where the electrification is not neutralized, we find the phenomena which indicate positive or negative electrification.

There are two distinctly different types of electricity being described by Maxwell. There is the current of flowing electrons where electrons move from one molecule to the next, and there is electrostatic polarization. The charging of static molecules involves the beginning of a current, but not an actual current. 

The relation between the electromotive force and the amount of electric displacement it produces depends on the nature of the dielectric, the same electromotive force producing generally a greater electric displacement in the solid dielectrics, such as glass or sulphur, than in air.

Here, Maxwell refers to electrostatic charging as electric displacement. When he talks about electric displacement or displacement currents, he is talking about charging and discharging dielectrics.

(12) Here, then, we perceive another effect of electromotive force, namely, electric displacement, which according to our theory is a kind of elastic yielding to the action of the force, similar to that which takes place in structures and machines owing to the want of perfect rigidity of the connexions. 

Remember, "elastic yielding" is a property of the environment, or Aether.  Aether exists within matter as well as around it. The electrostatic force belongs to the Aether and not to the matter. This is exactly what our Aether Physics Model suggests.

(13) The practical investigation of the inductive capacity of dielectrics is rendered difficult on account of two disturbing phenomena. the first is the conductivity of the dielectric, which, though in many cases exceedingly small, is not altogether insensible. The second is the phenomenon called electric absorption8, in virtue of which, when the dielectric is exposed to electromotive force, the electric displacement gradually increases, and when the electromotive force is removed, the dielectric does not instantly return to its primitive state, but only discharges a portion of its electrification, and when left to itself gradually acquires electrification on its surface, as the interior gradually becomes depolarized. Almost all solid dielectrics exhibit this phenomenon, which gives rise to the residual charge in the Leyden jar, and to several phenomena of electric cables described by Mr. F. Jenkin9.

This is why an electrophorus appears to recharge itself after being discharged. Although the electromotive force of electrons causes the structures of polarized space (Aether units) to rearrange within a material, the absence of the electrons does not cause the Aether structures to immediately disperse. Empty Aether units act independently from electrons.

(14) We have here two other kinds of yielding besides the yielding of the perfect dielectric, which we have compared to a perfectly elastic body. The yielding due to conductivity may be compared to that of a viscous fluid (that is to say, a fluid having great internal friction), or a soft solid on which the smallest force produces a permanent alteration of figure increasing with the time during which the force acts. The yielding due to electric absorption may be compared to that of a cellular elastic body containing a thick fluid in its cavities. Such a body, when subjected to pressure, is compressed by degrees on account of the gradual yielding of the thick fluid; and when the pressure is removed it does not at once recover its figure, because the elasticity of the substance of the body has gradually to overcome the tenacity of the fluid before it can regain complete equilibrium.

Maxwell is talking about the two types of yielding in addition to the electrostatic force. There is the yielding of matter and the yielding of the space within the matter. He aptly describes the space as a cellular membrane filled with thick fluids, specifically suggesting that space has structure.

Several solid bodies in which no such structure as we have supposed can be found, seem to possess a mechanical property of this kind10; and it seems probably that the