Institutio Oratoria

But in my opinion the origin of the basis varies and depends on the circumstances of the individual case. For instance in conjectural causes the affirmation may be regarded as determining the basis, since conjecture is employed by the plaintiff rather than the defendant, and consequently some have styled the basis originated by the latter negative. Again in any syllogism [*](i.e. where the law forms the major premise, while the minor premiss is the act which is brought under the law. ) the whole of the reasoning proceeds from him who

affirms.

But on the other hand he who in such cases [*](Conjectural causes and the syllogism.) denies appears to impose the burden of dealing with such bases upon his opponent. For if he says

I did not do it,

he will force his opponent to make use of con- jecture, and again, if he says

The law is against you,

he will force him to employ the syllogism. Therefore we must admit that a basis can originate in denial. All the same we are left with our previous conclusion that the basis is determined in some cases by the plaintiff, in some by the defendant.