13. We have already explained that discrete quantity is clearly
distinguished from continuous quantity, both by its own definition, and
the general definition (for quantity).[387] We may add that numbers are
distinguished from each other by being even and odd. If besides there
be other differences amidst the even and odd numbers, these differences
will have to be referred to the objects in which are the numbers, or to
the numbers composed of unities, and not any more to those which exist
in sense-beings. If reason separate sense-things from the numbers they
contain, nothing hinders us then from attributing to these numbers the
same differences (as to the numbers composed of unities).[388]