No More Learning

On one side of this jagged and shapeless hill
There is a cave, from which there eddies up
A pale mist, like aereal gossamer, _20
Whose breath destroys all life--awhile it veils
The rock--then,           by the wind, it flies
Along the stream, or lingers on the clefts,
Killing the sleepy worms, if aught bide there.