But these general intentions are
perfectly fulfilled in the constitution of our earth, which has been now
investigated. This great body being formed of different mixed masses,
having various degrees of hardness and solubility, proper soil for
plants is supplied from the gradual resolution of the solid parts;
fertility in those soils arises from the mixture of different elementary
substances; and stability is procured to that vegetable world, by the
induration of certain bodies, those rocks and stones, which protect the
softer masses of clay and soil.
In this manner, also, will easily be explained those natural appearances
which diversify the surface of the earth for the use of plants and
animals, and those objects which beautify the face of nature for the
contemplation of mankind. Such are, the distinctions of mountains and
valleys, of lakes and rivers, of dry barren deserts and rich watered
plains, of rocks which stand apparently unimpaired by the lapse of time,
and sands which fluctuate with the winds and tides. All these are the
effects of steady causes; each of these has its proper purpose in the
system of the earth; and in that system is contained another, which is
that of living growing bodies, and of animated beings.
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