[89] Some confusion has been introduced into the Grammar of the Latin language, by imposing different grammatical names on words, according to the connection in which they stood, while they retained their form and their signification unchanged; as in calling _quod_ at one time a Relative Pronoun, at another time a Conjunction; _post_ in one situation a Preposition, in another, an Adverb. An expedient was thought requisite for distinguishing, in such instances, the one part of speech from the other. Accordingly an accent, or some such mark, was, in writing or printing, placed over the last vowel of the word, when employed in what was reckoned its secondary use; while, in its primary use, it was written without any distinguishing mark. So the conjunction _quòd_ was distinguished from the relative _quod_; and the adverb _post_ from the preposition _pòst_. The distinction was erroneous; but the expedient employed to mark it was, at least, harmless. The word was left unaltered and undisguised; and thus succeeding grammarians had it the more in their power to prove that the relative _quod_ and the conjunction _quòd_ are, and have ever been, in reality, one and the same part of speech. It would have been justly thought a bold and unwarrantable step, had the older grammarians gone so far as to alter the letters of the word, in order to mark a distinction of their own creation.
[90] From this use of the preposition _air_ arises the _equivoque_ so humorously turned against Mr James Macpherson by Maccodrum the poet, as related in the Report of the Committee of the Highland Society of Scotland on the authenticity of Osian's Poems, Append. p. 95. Macpherson asked Maccodrum, "Am bheil dad agad air an Fhéinn?" literally, "Have you anything on the Fingalians?" intending to inquire whether the latter had any poems in his possession _on_ the subject of the Fingalian history and exploits. The expression partakes much more of the English than of the Gaelic idiom. Indeed, it can hardly be understood in Gaelic, in the sense that the querist intended. Maccodrum, catching up the expression in its true Gaelic acceptation, answered, with affected surprise, "Bheil dad agam air an Fhéinn? Ma bha dad riamh agam orra, is fad o chaill mi na còirichean." "Have I any claim on the Fingalians? If ever I had, it is long since I lost my voucher."