_2dly_, We find a fluid body of water. This, by gravitation, is reduced
to a spherical form, and by the centrifugal force of the earth's
rotation, is become oblate. The purpose of this fluid body is essential
in the constitution of the world; for, besides affording the means of
life and motion to a multifarious race of animals, it is the source of
growth and circulation to the organized bodies of this earth, in being
the receptacle of the rivers, and the fountain of our vapours.
_3dly_, We have an irregular body of land raised above the level of the
ocean. This, no doubt, is the smallest portion of the globe; but it is
the part to us by far most interesting. It is upon the surface of this
part that plants are made to grow; consequently, it is by virtue of
this land that animal life, as well as vegetation, is sustained in this
world.
_Lastly_, We have a surrounding body of atmosphere, which completes the
globe. This vital fluid is no less necessary, in the constitution of the
world, than are the other parts; for there is hardly an operation upon
the surface of the earth, that is not conducted or promoted by its
means.
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