Your wife’s a witch, man; you should nail a horse-shoe on your chamber-door.—Sir Walter Scott, Redgauntlet.
As a practical device for the protection of horses’ feet, the utility of the iron horse-shoe has long been generally recognized; and for centuries, in countries widely separated, it has also been popularly used as a talisman for the preservation of buildings or premises from the wiles of witches and fiends.
To the student of folk-lore, a superstition like this, which has exerted so wide an influence over men’s minds in the past, and which is also universally prevalent in our own times, must have a peculiar interest. What, then, were the reasons for the general adoption of the horse-shoe as a talisman? It is our purpose to consider the various theories seriatim.
Among the Romans there prevailed a custom of driving nails into cottage walls as an antidote against the plague. Both this practice and the later one of nailing up horse-shoes have been thought by some to originate from the rite of the Passover. The blood sprinkled upon the door-posts and lintel at the time of the great Jewish feast formed the chief points of an arch, and it may be that with this in mind people adopted the horse-shoe as an arch-shaped talisman, and it thus became generally emblematic of good luck.
The same thought may underlie the practice of the peasants in the west of Scotland, who train the boughs of the rowan or mountain-ash tree in the form of an arch over a farmyard gate to protect their cattle from evil.
III. HORNS AND OTHER TWO-PRONGED OBJECTS
The supernatural qualities of the horse-shoe as a preservative against imaginary demons have been supposed to be due to its bifurcated shape, as any object having two prongs or forks was formerly thought to be effective for this purpose. As with the crescent, the source of this belief is doubtless the appearance of the moon in certain of its phases.
Hence, according to some authorities, is derived the alleged efficacy as amulets of horse-shoes, the horns and tusks of animals, the talons of birds, and the claws of wild beasts, lobsters, and crabs. Hence, too, the significance of the oft-quoted lines from Robert Herrick’s “Hesperides:”—
Hang up hooks and sheers to scare
Hence, the hag that rides the mare.