quent to what is not animal. In all cases then such must be admitted, as if the beautiful is pleasant, the unpleasant is not beautiful, and if this is not, neither will that be; likewise also if the unpleasant is not beautiful, the beautiful is pleasant, wherefore it is clear that the consequence according to contradiction being inverted, converts to both.
In contraries indeed, both the subverter and the constructers must consider, whether the contrary follows the contrary directly, or inversely, but must also assume such things, as far as it is useful, from induction. The consequence then is direct, for instance, to bravery and timidity, for to the one, virtue, but to the other, vice, is consequent, and the eligible follows the one, but what is to be avoided, the other, therefore the consequence of these also is direct, since the eligible is contrary to what is to be avoided, and similarly in other things. But the consequence is inverse, as health indeed follows a good habit of body, but disease does not, a bad habit, but a bad habit of body is consequent to disease, wherefore it is clear that the consequence in these, is inverse. Nevertheless, the inverse rarely occurs in contraries, but in most of them the consequence is direct; if then the contrary follows the contrary, neither directly nor inversely, it is manifest that neither in what is asserted, is the one, consequent to, the other, but if in contraries, in the assertions also, it is requisite, that the one should be consequent to the other.
As in contraries, so also must we consider in privations and habits, except that in privations the inverse does not occur, but the consequence must of necessity always be direct, just as sense follows sight, and privation of sense, blindness, for sense is opposed to the privation of sense, as habit and privation, since one of these is habit, but the other is privation.
Relatives also, we must use in a similar way to habit and privation, for their consequence is direct, as if the triple is multiple, the sub-triple also is sub-multiple, for the triple is referred to the sub-triple, and the multiple to the sub-multiple. Again, if science is opinion, the object of science will also be the object of opinion, and if vision is sense, the
