reveals.
In the
first case
the two
sexual
elements
which go
to form
the embryo
are
perfect;
in the
second
case they
are either
not at all
developed,
or are
imper-
fectly
developed.
This
distinction
is
important,
when the
cause of
the
sterility,
which is
common to
the two
cases, has
to be
considered.
The
distinction
has
probably
been
slurred
over,
owing to
the
sterility
in both
cases
being
looked on
as a
