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Natural
selection
can
act
only
by
the
preservation
and
accumulation
of
infinitesimally
small
inherited
modifications,
each
profitable
to
the
preserved
being;
and
as
modern
geology
has
almost
banished
such
views
as
the
excavation
of
a
great
valley
by
a
single
diluvial
wave,
so
will
natural
selection,
if
it
be
a
true
principle,
banish
the
belief
of
the
continued
creation
of
new
organic
beings,
or
of
any
great
and
sudden
modification
in
their
structure.
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