e. About the Statement Added in Exposition of the Second Conclusion

383. Against what he himself adds in exposition of the second conclusion [n.330], namely that motion which is here per se according to quality is not without a subject, although what accompanies (namely quantity) the per se term of this motion is without a subject - against this as follows: Rarity is the first formal term of the formal motion of rarefaction; but the subject of it is the whole quantum; therefore the whole quantum is naturally presupposed to the term. Therefore, so much quantum cannot per accidens be acquired by the fact that so much quality is acquired, because what is naturally prior and presupposed to something else is not acquired merely by the fact that what is naturally posterior is acquired; rather the prior is presupposed having already been acquired.