wine accidentally, since if it should be sour, he no longer desires it, therefore he desires it from accident. This place however is useful in relatives, for almost all such things as these, belong to relatives.
Chapter 4
Again, a change must be made into a name more known, as, for instance, the clear instead of the accurate in notion, and the love of employment instead of being engaged in various occupations, for the assertion being more known, the thesis is more easily opposed. This place also is common to both confirmation and subversion.
In order however to show that contraries are present with the same thing, it is necessary to attend to the genus; thus if we desire to prove that there is rectitude and error about sense, since sensibly to perceive, is to judge, but it is possible to judge rightly and not rightly, about sense also, there will be rectitude and error. Now, then, from the genus the demonstration is concerning the species, since to judge is the genus of sensible perception, for he who sensibly perceives, in some way judges. Again, from species to genus, for whatever things are present with species are also with genus, as if science is bad and good, disposition also is bad and good, for disposition is the genus of science. The former place therefore is false indeed for confirmation, but the latter is true, since it is not necessary that whatever things are present with genus, should also be present with species, since animal is winged and quadruped, but man is not, yet whatever things are present with species, are necessarily also with genus, for if man is good, animal also is good. Still for subversion, the former is true, but the latter false, as whatever are not present with genus, neither are with species, but it is unnecessary that whatever are not with species, should not be present with genus.
Notwithstanding, since it is requisite that of what things genus is predicated, some species also
