(for then there would again be something else belonging to odd in which odd inhered; and if this is prime, number will inhere in what belongs to it; so if it is not possible for infinitely many such things to belong in the one thing, they will not be infinitely many in the upward direction; but it is necessary that everything belongs to the primitive term, ie to number, and number to them, so that they will be convertible and will not exceed it).