Institutio Oratoria

Quintilian

Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.

Again, the term difference is applied in cases when the genus is divided into species and one species is subdivided. Animal, for instance, is a genus, mortal a species, while terrestrial or biped is a difference: for they are not actually properties, but serve to show

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the difference between such animals and quadrupeds or creatures of the sea. This distinction, however, comes under the province not so much of argument as of exact definition. Cicero [*](Cic. Top. iii. 13. ) separates genus and species,

which latter he calls form, from definition and includes them under relation. For example, if a person to whom another man has left all his silver should claim all his silver money as well, he would base his claim upon genus; on the other hand if when a legacy has been left to a married woman holding the position of materfamilias, it should be maintained that the legacy is not due to a woman who never came into the power of her husband, the argument is based on species, since there are two kinds of marriage. [*]( There was the formal marriage per coemptionem, bringing the woman under the power ( in manum )of her husband and giving her the title of materfamilias, and the informal marriage based on cohabitation without involving the wife's coming in manum mariti. ) Cicero [*]( Cic. Top. )

further shows that definition is assisted by division, which he distinguishes from partition, making the latter the dissection of a whole into its parts and the former the division of a genus into its forms or species. The number of parts he regards as being uncertain, as for instance the elements of which a state consists; the forms or species are, however, certain, as for instance the number of forms of government, which we are told are three, democracy, oligarchy, and monarchy. It is true that he does not use these illustrations,

since, as he was writing to Trebatius, [*]( A famous lawyer, cp. III. xi. 18. v. 17. ) he preferred to draw his examples from law. I have chosen my illustrations as being more obvious. Properties have relation to questions of fact as well; for instance, it is the property of a good man to act rightly, of an angry man to be violent in speech or action, and consequently we believe that such acts are committed by persons of the appropriate character, or

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not committed by persons of inappropriate character. For just as certain persons possess certain qualities, so certain others do not possess certain qualities, and the argument is of precisely the same nature, though from opposite premises.