Trembling the Sepctres glide, and plaintive vent
Thin, hollow screams, along the deep descent.
As in the cavern of some rifted den,
Where flock nocturnal bats, and birds obscene;
Cluster'd they hang, till at some sudden shock,
They move, and murmurs run thro' all the rock:
So cow'ring fled the sable heaps of ghosts,
And such a scream fill'd all the dismal coasts.