Lines 179-185 were substituted in 1845 for

A giant moan along the forest swells
Protracted, and the twilight storm foretels,
And, ruining from the cliffs, their deafening load
Tumbles,--the wildering Thunder slips abroad;
On the high summits Darkness comes and goes,
Hiding their fiery clouds, their rocks, and snows;
The torrent, traversed by the lustre broad,
Starts like a horse beside the flashing road;
In the roofed bridge, at that terrific hour,
She seeks a shelter from the battering show'r.
--Fierce comes the river down; the crashing wood
Gives way, and half it's pines torment the flood;
[iv] Fearful, beneath, the Water-spirits call,
And the bridge vibrates, tottering to its fall. 1820.

When rueful moans along the forest swell
Protracted, and the twilight storm foretel,
And, headlong from the cliffs, a deafening load
Tumbles,--and wildering thunder slips abroad;
When on the summits Darkness comes and goes,
Hiding their fiery clouds, their rocks, and snows;
And the fierce torrent, from the lustre broad,
Starts, like a horse beside the flashing road--
She seeks a covert from the battering shower
In the roofed bridge; the bridge, in that dread hour,
Itself all quaking at the torrent's power. 1836.]