For there are
some nouns which are cognate, that is to say of the
same genus, and he who uses the wrong species1 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 sit2;
1e.g. intusfor intro, the genusbeing adverbs of place.
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