Various, Notes and Queries, Number 19, March 9…
“ Cron Annwn.—When a storm sounds over the mountains, the Welsh peasant will tell you that his ear discerns the howl of the Cron Annwn mingling with that of the wind, yet as clearly distinct from it as is the atmosphere in a diving-bell from that of the surrounding waters. These dogs of Annwn, or "couriers of the air," are spirit hounds, who hunt the souls of the dead; or, as occasionally said, they foretell, by their expectant cries, the approaching death of some man of evil deeds. Few have ever pretended to see them; for few, we presume, would linger until they dawned on the sight ”
