Both the interior construction and exterior form of the moon, as modified by losing its rotary motion, would no doubt be very different to that of a hollow sphere rotating on its axis; but Hansen's "curious theory" has prepared us for this, by showing that some anomaly in its construction had been noted and commented upon, although the existence of the anomaly was not attributed to the atmosphere on its having been driven away to the far-off hemisphere. But with this subject we have dealt pretty fully already in Chapter II., which may be referred to for further explanation if required. CHAPTER XII. PAGE 215 Some of the results arising from the sun's being a hollow sphere. 216 Repetition of the effects of condensation on the temperature of the nebula. 217 Ideas called up by the apparently anomalous increase of temperature. 218 How heat is carried from the sun to the earth. 219 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. 220 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. 221 The sun must be gaseous, or rather gasiform, throughout. No matter in it solid or even liquid. Divisions and densities of shell. 222 The hollow centre filled with gases, whose mass naturally diminishes the mean density of the whole body. 223 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. 224 Further exposition of hollow-sphere theory put off till after further development of the construction of the sun.