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