It has not
unfrequently happened, that the researches made at remote distances have
often and unexpectedly thrown light upon subjects which had long resisted
the attempts made to explain them within the narrow limits of our own sphere
of observation. Organic forms that had long remained isolated, both in the
animal and vegetable kingdom, have been connected by the discovery of
intermediate links or stages of transition. The geography of beings endowed
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with life attains completeness as we see the species, genera, and entire
families belonging to one hemisphere, reflected as it were, in analogous
animal and vegetable forms in the opposite hemisphere. There are, so to
speak, the 'equivalents' which mutually personate and replace one another in
the great series of organisms. These connecting links and stages of
transition may be traced, alternately, in a deficiency or an excess of
development of certain parts, in the mode of junction of distinct organs, in
the differences in the balance of forces, or in a resemblance to
intermediate forms which are not permanent, but merely characteristic of
certain phases of normal development. Passing from the consideration of
beings endowed with life to that of inorganic bodies, we find many striking
illustrations of the high state of advancement to which modern geology has
attained.
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