All Hallows eve is by the Welsh called ‘Nos Calan Gauaf,’ meaning ‘the first night of winter;’ sometimes, ‘Nos Cyn Gauaf,’ the ‘night before winter.’ It is one of the ‘Teir Nos Ysprydnos,’ or ‘three nights for spirits,’ upon which ghosts walk, fairies are abroad, mysterious influences are in the air, strange sights are seen, and in short goblins of every sort are to be with special freedom encountered.