Their voyage was begun:[337] nor is its power
Unfelt among the sedentary fowl
That seek yon pool,[EM] and there prolong their stay
In silent congress; or together roused
Take flight; while with their clang the air resounds.
And, over all, in that ethereal vault,[338]
Is the mute company of changeful clouds;
Bright apparition, suddenly put forth,
The rainbow smiling on the faded storm;
The mild assemblage of the starry heavens;