583. The calcareous earth has originated in the upper parts of the aqueous globe, the other earths, however, in the depths, in the middle of that globe; for in the upper regions of the water, the light can exert a greater polarizing influence, and therefore that very earth is generated which stands nearest to the æther or to the light, viz. the different calcareous earth. But in the depths of the water, the light loses its energy, and is no longer in a condition to elicit the Oxygenous in the Basic; thereby identical and more fixed earths originate.
584. The differenced calcareous earth has been associated with the differential water, remained for a longer period identical with and dissolved in it, and was therefore the last to be precipitated from it. The silicious earth with its neighbours must necessarily have been the first to separate from the water, as it is in a proper sense, that earth from which all water has been withdrawn. Two periods of precipitation exist therefore in geogeny, one that of the identical or fundamental earths, and one of the internally subdivided calcareous earths.
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.