Francis Melville describes a spae-wife as a type of elf in The Book of Faeries. No taller than a human finger, fairy spae wives are usually dressed in the clothes of a peasant. However, when properly summoned, the attire changes from common to magnificent: blue cloak with a gem-lined collar and black lambskin hood lined with catskin, calfskin boots, and catskin gloves. Like human spae wives, they can also predict the future, through runes, tea leaves and signs generated by natural phenomena, and are good healers. They are said to be descended from the erectors of the standing stones.