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.