On occasions, Virgil permits himself a certain licence in his metrication, when he lengthens syllables at the end of words which would normally be short both by nature and by position. Ancient authorities commentating on these irregularities explain them either by focusing on their position in the verse, or by suggesting that Virgil's usage in these instances reflects that these syllables had been long in quantity in earlier periods of Latin poetry. With regard to the first of these tentative explanations, it is indeed the case that in...