of the
hybrids
produced
from them.
Pure
species
have of
course
their
organs of
reproduction
in a
perfect
condi-
tion, yet
when
intercrossed
they
produce
either few
or no
offspring.
Hybrids,
on the
other
hand, have
their
reproductive
organs
functionally
impotent,
as may be
clearly
seen in
the state
of the
male
element in
both
plants and
animals;
though the
organs
themselves
are
perfect in
structure,
as far as
the
microscope
