Another example of the latter:
Soft is the strain when Zephyr gently blows,
And the smooth stream in smoother numbers flows.
Essay on Crit. 366.
Fifthly, prolonged motion is expressed in an Alexandrine line. The first example shall be of slow motion prolonged:
A needless Alexandrine ends the song;
That, like a wounded snake, drags its slow length along.
Essay on Crit. 356.
The next example is of forcible motion prolonged:
The waves behind impel the waves before,
Wide-rolling, foaming high, and tumbling to the shore.
Iliad, xiii. 1004.
The last shall be of rapid motion prolonged:
Not so when swift Camilla scours the plain,
Flies o’er th’ unbending corn, and skims along the main.
Essay on Crit. 373.
Again, speaking of a rock torn from the brow of a mountain,
Still gath’ring force, it smokes, and, urg’d amain,
Whirls, leaps, and thunders down, impetuous to the plain.
Iliad, xiii. 197.