Institutio Oratoria

Solecisms also occur with great frequency in connexion with parts of speech: but a bare statement on this point is not sufficient, as it may lead a boy to think that such error consists only in the substitution of one part of speech for another, as for instance if a verb is placed where we require a noun, or an adverb takes the place of a pronoun and so on.

For there are some nouns which are cognate, that is to say of the same genus, and he who uses the wrong species [*](e.g. intus for intro, the genus being adverbs of place. ) in connexion with one of these will be guilty of the same offence as if he were to change the genus. Thus an and aut are conjunctions, but it would be bad Latin to say in a question hic and ille sit [*]( For hic an ille sit? ) ;

ne and

Similar errors may be committed in connexion with the various kinds of pronouns, interjections and prepositions. It is also a solecism [*]( The meaning of this passage is uncertain, but the solecism in question is probably an anacoluthon. ) if there is a disagreement between what precedes and what follows within the limits of a single clause.

Some phrases have all the appearance of a solecism and yet cannot be called faulty; take for instance phrases such as tragoedia Thyestes or ludi Floralia and Megalensia [*]( Where strict grammar would require tragoedia Thyestis, ludi Florales, Megalenses. The normal usage would be simply to say Thyestes, Floralia, Megalensia. ) : although these are never found in later times, they are the rule in ancient writers. We will therefore style them figures and, though their use is more frequent in poets, will not deny their employment even to orators.