as well as
to
corporeal
structure,
and is
plainly
explicable
on the
foregoing
views, but
is
otherwise
inexplicable,—all
tend to
corroborate
the theory
of natural
selection.
This
theory is,
also,
strengthened
by some
few other
facts in
regard to
in-
stincts;
as by that
common
case of
closely
allied,
but
certainly
distinct,
species,
when
inhabiting
distant
parts of
the world
and living
under
considerably
dif-
ferent
conditions
of life,
yet often
