But we are speculating too soon. It may be said that if the Zodiacal Light is caused by the ether, and if the ether is a material substance, it must be exhausted sooner or later, just the same as all other matter and the whole universe to one mass the same as before; and also that we have no authority for supposing that the ether can be heated and cooled or condensed and expanded. But we think that with what we have done in this chapter, and what we will be able to show in the following one, we shall be able to get over all these difficulties, and also show how the universe might be dissolved and renewed by the ordained process of evolution. CHAPTER XIV. PAGE 244 The ether considered and its nature explained. Further proofs given by Dr. Crookes's work, of its material substance. 246 Highest vacuum yet produced. Absorbents cannot absorb the ether. 247 Dr. Crookes's definition of a gas. Not satisfactory. Why. 248 A fluid required to pump matter out of a vessel. 249 Gas as described by Dr. Crookes would not suit. 250 The ether the only elastic fluid we have. The only real gas, if it is a gas. 250 A possible measure of the density of the ether. 251 Causes of dark and light zones in high vacua. 252 The real conductor of light in a high vacuum. 254 How a vacuum tube glows, when electricity passes through it. 255 Conclusions arrived at through foregoing discussions. 256 Some exhibitions of light explained. 257 Gases can be put in motion, but cannot move even themselves. 258 The ether shown to be attraction. And primitive matter also. 259 All chemical elements evolved from it. Its nature stated. 259 Action at a distance explained by the ether and attraction being one and the same.