(Browning: Prospice.)
Here the tendency is to use iambi and anapests in alternate feet; see especially lines 2, 3, and 5.
All we have willed or hoped or dreamed of good, shall exist;
Not its semblance, but itself; no beauty, nor good, nor power
Whose voice has gone forth, but each survives for the melodist
When eternity affirms the conception of an hour.
The high that proved too high, the heroic for earth too hard,
The passion that left the ground to lose itself in the sky,
Are music sent up to God by the lover and the bard;
Enough that He heard it once: we shall hear it by-and-by.
(Browning: Abt Vogler.)
Here we have a hexameter which is neither iambic nor anapestic, but a combination of the two rhythms. So in the following specimens dissyllabic and trisyllabic feet are used interchangeably.
When the lamp is shatter'd
The light in the dust lies dead—
When the cloud is scatter'd
The rainbow's glory is shed.
When the lute is broken,
Sweet tones are remember'd not;
When the lips have spoken,
Loved accents are soon forgot.
(Shelley: The Flight of Love.)
The sea is at ebb, and the sound of her utmost word
Is soft at the least wave's lapse in a still small reach.
From bay unto bay, on quest of a goal deferred,
From headland ever to headland and breach to breach,
Where earth gives ear to the message that all days preach.