Analysis continued. No contingent of heat could be imparted to any planet by the parent nebula 126 Only one degree of heat added to the nebula from the beginning till it had contracted to the density of 1/274th of an atmosphere 127 Increase in temperature from 0° to possible average of 274° when condensed to 4,150,000 miles in diameter 127 Time when the sun could begin to act as sustainer of life and light anywhere. Temperature of space 128 The ether devised as carrier of light, heat, etc. What effect it might have on the nebula 129 First measure of its density, as far as we know 130 The estimate _too_ high. May be many times less 133 Return to the solar nebula at 63,232,000 miles in diameter 134 Plausible reason for the position of Neptune not conforming to Bode's Law. The ring being very wide had separated into two rings 134 Bode's law reversed. Ideas suggested by it 135 Rates of acceleration of revolution from one planet to another 137 Little possibility of there being a planet in the position assigned to Vulcan 138 Densities of planets compared. Seem to point to differences in the mass of matter abandoned by the nebula at different periods 138 Giving rise to the continuous sheet of matter separating into different masses. Probably the rings had to arrive at a certain stage of density before contracting circumferentially 139 Possible average temperature of the sun at the present day. Central heat probably very much greater 140 Churning of matter going on in the interior of the sun, caused by unequal rotation between the equator and the poles 140
Inquiry into the Interior Construction of the Earth. What is really known of the exterior or surface 142 What is known of the interior 143 Little to be learned from Geology, which reaches very few miles down 144 Various notions of the interior 145 What is learnt from earthquake and volcanoes. Igno-aqueous fusion, liquid magma. 146 Generally believed that the earth consists of solid matter to the centre. Mean density. Surface density 147 More detailed estimate of densities near the surface 148 Causes of increased surface density after the crust was formed 148 Calculations of densities for 9 miles deep, and from there to the centre forming Table IV. 150 Reflections on the results of the calculations 151 Notion that the centre is composed of the heaviest metals. "Sorting-out" theory absurd 151 Considerations as to how solid matter got to the centre 152 Gravitation might carry it there, but attraction could not 153 How the earth could be made out of cosmic matter, meteorites or meteors 154