Edgar Allan Poe,
The Rationale of Verse
“ Of the Greek hexameter the intentional basis is spondaic. The dactyls are the variation of the theme. It will be observed that there is no absolute certainty about their points of interposition. The penultimate foot, it is true, is usually a dactyl but not uniformly so, while the ultimate, on which the ear lingers, is always a spondee. Even that the penultimate is usually a dactyl may be clearly referred to the necessity of winding up with the distinctive spondee. ”
