But, the solid land is only one part of the globe; therefore,
the philosophy of the globe proceeds still farther by knowing the
constitution of this planetary body, as consisting of different parts
united for a purpose, which is that of a world.
The general theory of this earth as a world, will thus appear to be a
complex thing, which however founded upon simple principles, contains
many subjects of discussion, and requires attention to a variety of
particulars. For, not only the great features of this earth are to be
explained by the theory, but also the most minute appearance, such as
are to be found, even with microscopic observation, in every particular
part.
Thus the nature, constitution, and cause of every particular appearance
in the construction of this earth, are to be investigated in a
geological theory, as well as that general constitution of the world in
which all the particular parts are to be employed for a purpose.
If the subject here examined shall be found properly explained, there
will remain little doubt with regard to the justness of the theory,
which will then be applicable to other appearances that may occur;
although every appearance is not to be explained, in a manner equally
satisfactory, by any theory which is not perfect.
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