In the case where the compound occupies more space than each element
separately, it might (though with little probability), be asserted,
that, since every body, along with its other qualities, implies size, a
local extension must take place. No more than the other qualities could
this increase perish. Since, out of both qualities, arises a new form,
as a compound of the mixture of both qualities; so also must another
size arise, the mixture combining the size out of both. Here (the
Peripatetics) might answer (the Stoics): "If you assert a juxtaposition
of substances, as well as of the masses which possess extension, you
are actually adopting our opinions. If however one of the masses, with
its former extension, penetrate the entire mass of the other, the
extension, instead of increasing, as in the case where one line is
added to another by joining their extremities, will not increase any
more than when two straight lines are made to coincide by superimposing
one on the other."