Aubrey, in his “Remains of Gentilisme,” describes the horse-shoe as a preservative against the mischief or power of witches, attributing its magical properties to the astrological principle that Mars, the God of War and the War Horse, was an enemy of Saturn, who according to a mediæval idea was the liege lord of witches.[180] During the witchcraft excitement in Scotland, one Elizabeth Bathcat was indicted for having a horse-shoe attached to the door of her house “as a devilish means of instruction from the Devil to make her goods and all her other affairs to prosper and succeed well.”[181] According to an old legend St. Dunstan, the versatile English ecclesiastic of the tenth century, who was a skilled farrier and the owner of a forge, was requested by the Devil to shoe his “single hoof.” Dunstan, who recognized his customer, acceded, but during the operation he caused the Devil so much pain that the latter begged him to desist. The request was heeded on condition that the Devil should never enter a place where a horse-shoe was displayed.[182] The popular belief is that his Satanic Majesty has always faithfully kept the contract, and quite naturally all lesser evil spirits have followed his example. In Scotland, even as late as the beginning of the nineteenth century, the peasantry believed that witches were able to draw milk from all the cattle in their neighborhood, by tugging at a hair-rope in imitation of the act of milking. Such a rope was made of hairs from the tails of several cows, whose exact number was indicated by knots in the rope. While tugging at the rope the witches repeated either the following or a similar charm:— Cow’s milk and mare’s milk, And every beast that bears milk, Between St. Johnstone’s and Dundee, Come a’ to me, come a’ to me. The only adequate protection from such mischievous pranks as these was afforded by nailing a horse-shoe to the byre-door and tying sprigs of rowan with a red thread to the cow’s tail. If, however, these precautions were neglected, the guilty witch might yet be discovered by placing the “gudeman’s breeks” upon the cow’s horns, a leg upon either horn; and thereupon the animal, being let loose, was sure to run directly to the witch’s house.[183]