For when we have shown that the content of the definition fails to belong to the subject alone, as we do in the case of a property, or that the genus rendered in the definition is not the true genus, or that any of the things mentioned in the phrase used does not belong, as would be remarked in the case of an accident, we shall have demolished the definition; so that, in the sense previously described, all the points we have I enumerated might in a way be called definitory.