Then the music touch'd the gates and died;
Rose again from where it seem'd to fail,
Storm'd in orbs of song, a growing gale;
Till thronging in and in, to where they waited,
As 'twere a hundred-throated nightingale,
The strong tempestuous treble throbbed and palpitated;
Ran into its giddiest whirl of sound,
Caught the sparkles, and in circles,
Purple gauzes, golden hazes, liquid mazes,
Flung the torrent rainbow round:
Then they started from their places,
Moved with violence, changed in hue,
Caught each other with wild grimaces,
Half-invisible to the view,
Wheeling with precipitate paces
To the melody, till they flew,
Hair, and eyes, and limbs, and faces,
Twisted hard in fierce embraces,
Like to Furies, like to Graces,
Dash'd together in blinding dew.
(Tennyson: Vision of Sin.)
ii. Verses in which individual feet are altered from the metrical scheme.
Even in metre exhibiting no marked irregularities, it is of course rather exceptional than otherwise to find all the feet in a verse conforming to the type-foot of the metre. Departures from the typical metre may be conveniently classified in five groups: Deficiency in accent; excess of accent; inversion of accent; light syllable added to dissyllabic foot; light syllable omitted in trisyllabic foot.
Deficiency of accent is the most common of all the variations, if we understand by "accent" such syllabic stress as would be ordinarily appreciable in the reading of the word in question. It would be safe to say that in English five-stress iambic verse, read with only the ordinary etymological and rhetorical accents, twenty-five per cent of the verses lack the full five stresses characteristic of the type. In many cases, too, a foot with deficiency in stress is compensated for by another foot in the same verse showing excess of stress. Feet thus deficient in stress may conveniently be called pyrrhics, the pyrrhic being understood as made up of two unstressed syllables. This term has never become fully domesticated in English prosody, and some object to its use on the ground that we have no feet wholly without stress. Its use in the sense just indicated, however, seems to be an unquestionable convenience.
Excess of accent, while less common than deficiency of accent, is even more easily recognizable. The foot containing two stressed syllables, even though one of the stresses may be distinctly stronger than the other, may conveniently be called a spondee.
Inversion of accent is exceedingly familiar, especially at the beginning of the verse and after the medial pause. It consists, technically speaking, in the substitution of a trochee for an iambus or an iambus for a trochee (the latter very rarely).
A light syllable inserted in dissyllabic measure is not unusual, though by no means so common as the variations previously enumerated. Such a syllable is frequently spoken of as "hypermetrical"; or, the variation may be considered as the substitution of an anapest for an iambus, in iambic measure, or the substitution of a dactyl for a trochee, in trochaic measure.
The omission of one of the two light syllables from the foot in trisyllabic verse is so common as to make it difficult to find pure anapestic or dactylic verse in English. This fact is due in part to preference for dissyllabic measures, and in part to the usual indifference, in all Germanic verse, to accuracy in the number of light syllables. The variation may frequently be regarded as involving a prolongation of the light syllable of the foot, or a pause equal to the time of the omitted syllable; technically speaking, it consists in the substitution of an iambus for an anapest, or a trochee for a dactyl.