The Scilly Isles are supposed to be the tops of the hills belonging to the lost land and so are the Seven Stones, a jagged ridge midway between them and Land's End, whence in fine weather the isles can be seen as faint cirrus clouds lying along the horizon.
"Cornwall"
G. E. Mitton
The moon was just rising, and there was enough light to see heavy cirrus moving high overhead.
"The Wailing Octopus"
Harold Leland Goodwin
And there, placidly smoking his cigar and watching the wreaths of blue smoke with the air of an idle seraph contemplating a wisp of cirrus in Heaven's firmament, sat the man who could have given me the word of the enigma.
"The Red Planet"
William J. Locke