Ann Radcliffe, The Mysteries of Udolpho — Volume III, Chapter IV
“ Emily heard the passing steps of the sentinels, on the rampart, as they changed guard; and, when all was again silent, she took her station at the casement, leaving her lamp in a remote part of the chamber, that she might escape notice from without. The moon gave a faint and uncertain light, for heavy vapours surrounded it, and, often rolling over the disk, left the scene below in total darkness. It was in one of these moments of obscurity, that she observed a small and lambent flame, moving at some distance on the terrace. ”
