The Fairy-Faith in Celtic Countries , by Walter Yeeling Evans-Wentz was originally published in 1911. The work is one of the most detailed and scholarly attempts to explain the occurrence of the Celtic belief in fairies. Based on Evans-Wentz' Oxford doctoral thesis, it includes an wide survey of the literature from many different positions, including folk-lore, history, anthropology and psychology. The core of the book is the ethnographic fieldwork conducted by Evans-Wentz himself, an indispensable recording of the fairy belief system taken just on the edge of modernity. There are localised surveys of the fairy-faith in Ireland, Wales, Scotland, Brittany and the Isle of Man.