585. The silicious, argillaceous, and talcose earths must occupy, from their having been first precipitated, the middle of the planet. The water being earthy everywhere, had everywhere the capacity to become earth; but different earths originated, where the light was different in the fluid mass of earth. In pure light, or that upon the surface, the Earthy dualized itself into calcareous earth; in situations, where the light exercised less influence, the Earthy became talcose, still deeper argillaceous earth; lastly, at such a depth where the light could scarcely reach, the Earthy became a pure Earthy or silicious earth. 586. Precipitation, both upon a large and small scale, is a process of crystallization; the integral parts of the planet originate, like the nucleus and the perfected crystal, through central action and polar action. The integral forms of the planet impart the crystalline granule or its joints. 587. The integral forms of the three fundamental earths crystallized with and through each other into _one_ mass, or, in other words, the nucleus of the earth consists of a crystalline mass of the three fundamental earths. The solid nucleus of the earth consists of crystals upon a small scale of silex, clay, and talc. 588. As, however, no pole is produced of perfect purity in nature, so are the integral forms not perfectly pure fundamental earths, but other and later factors enter also into their composition, e. g. calcareous earth, with even ores and salts. The silicious earth is crystallized as quartz, the argillaceous as feldspar, the talc as mica. 589. The mixture of the three crystallized fundamental earths, which composes the nucleus of the earth, and upon which the polarized masses of soil have been supported, is therefore a definite species of rock, which has all the properties of _Granite_, although that which has been extruded from the earth may have been altered by heat. 590. As the mass of the earth is about five times denser than water; so must the planet, before the Earthy was separated, have been much denser than at present. With its separation the fluid must have suddenly diminished, and moved towards the middle point of the planet. During the descent of water for many miles in extent, it must separate in drops. The separation of the earths was combined with rain. 591. In every falling drop the three fundamental earths, which are insoluble in water, crystallized. The first crystals therefore are only of the size of drops. It is only by this mode of origin that the crystallization into one another of the three constituent parts of granite without any cementing substance can be comprehended. Granite is an earthy hail-storm. The hail-stones crystallized during their fall in a similar manner with each other.