class="tdr">214

CHAPTER XII.
  Some of the results arising from the sun's being a hollow sphere 215 Repetition of the effects of condensation on the temperature of the nebula 216 Ideas called up by the apparently anomalous increase of temperature 217 How heat is carried from the sun to the earth 218 The sun supposed to radiate heat only to bodies that can receive and hold it,     and not to all space. The heat of the sun accumulated in a     hot box to considerably beyond the boiling point of water 219 The heat accumulated in this way supposed to be due to a peculiar function of the ether,     as it is a fact that heat can be radiated from a cold to a hot body 220 The sun must be gaseous, or rather gasiform, throughout. No matter in it solid     or even liquid. Divisions and densities of shell 221 The hollow centre filled with gases, whose mass naturally     diminishes the mean density of the whole body 222 The amount of this reduction so far defined. The presence of gases or vapours     in the hollow a natural result of condensation 223 The hollow centre filled with gases not incompatible with the sun's being     a hollow sphere. The temperature at the centre may be anything,     not depending on any law of gases 223 Further exposition of hollow-sphere theory put off till after     further development of the construction of the sun 224
CHAPTER XIII.
  The ether. Its nature considered. Behaves like a gas 226 Can be pumped out of a receive 227 Light and heat do not pass through a tube in vacuo.     Laboratory experiments examined 228 Light and darkness in a partial vacuum, though high 229 Electricity not a carrying agent 230 Why there are light and dark strata in a high vacuum 232 The real carrying agent through a high vacuum is the residue     of ether left in it. Digression to consider the aurora 233 How air may be carried to extraordinary heights. Zones of     air carried up are made luminous by electricity 234 Comparison of this method with experiments quoted 236 Experiment suggested to prove whether light passes freely through a vacuum tube 237 The ether does not pervade all bodies freely 238 It must be renounced altogether or acknowledged to be a material body,     subject to expansion, condensation, heating or cooling 239 How light and heat pass through glass 239 Temperature of the ether variable. Zodiacal light, cause of 240
CHAPTER XIV.
  The ether considered and its nature explained. Further proofs     given by Dr. Crookes's work, of its material substance 244 Highest vacuum yet produced. Absorbents cannot absorb the ether 246 Dr. Crookes's definition of a gas. Not satisfactory. Why 247 A fluid required to pump matter out of a vessel 248 Gas as described by Dr. Crookes would not suit 249 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 250 Causes of dark and light zones in high vacua 251 The real conductor of light in a high vacuum 252 How a vacuum tube glows, when electricity passes through it 254 Conclusions arrived at through foregoing discussions 255 Some exhibitions of light explained 256 Gases can be put in motion, but cannot move even themselves 257 The ether shown to be attraction. And primitive matter also 258 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 259
CHAPTER XV.
  Construction of the solar system. Matter out of which it was formed 261 Domains of the sun out of which the matter was collected 262 Stars nearest to the sun. Table VII. showing distances 263 Remarks on Binary Stars. Table VIII. showing spheres of     attraction between the sun and a very few 265 Sirius actually our nearest neighbour. Form of the sun's domains of a very jagged nature 266 Creation of matter for the nebulæ, out of which the whole universe was   elaborated. Beginning of construction 267 The law of attraction begins to operate through the agency of evolution 267 Form of the primitive solar nebula. The jagged peaks     probably soon left behind in contraction 268 How the nebula contracted. Two views of the form it might take.