consider then whether the contrary also is in the irascible part, friendship, for if not, but friendship is appetitive, hatred would not follow anger. Likewise, also, if he said that the appetitive part of the soul was ignorant, for it will be capable of science, if indeed it is of ignorance, which does not seem to be the case, that the appetitive part should be capable of science. Whoever therefore subverts, should, as we have said, use this place, but it is not useful to one who confirms that accident is inherent, though it is useful to show that it is possible to be inherent. For when we have shown that it is not susceptible of the contrary, we shall have shown that accident is neither, nor can be, inherent; but if we have shown that the contrary is inherent, or that it is susceptible of the contrary, we shall not yet have shown that accident also is inherent, but it will only be so far proved that it may be inherent.
Chapter 8
As oppositions are four, we must consider (whether we can derive an argument) from contradictions, the consequence being inverse both for subversion and confirmation, and we must assume from induction, as if a man is animal, what is not animal is not man, likewise in other things; for here the consequence is inverse, since animal is consequent to man, but what is not animal is not consequent to what is not man, but inversely what is not man is conse-
