According to the same author, iron has valuable attributes as a preservative against harmful witchcrafts and sorceries, and may thus be used with advantage both by adults and children. For this purpose it was only necessary to trace a circle about one’s self with a piece of the metal, or thrice to swing a sword around one’s body. Moreover, gentle proddings with a sword wherewith a man has been wounded were reputed to alleviate divers aches and pains, and even iron-rust had its own healing powers:— If a horse be shod with shoes made from a sword wherewith a man has been slain, he will be most swift and fleet, and never, though never so hard rode, tire.[59] The time-honored belief in the magical power of iron and steel is shown in many traditions of the North. A young herdswoman was once tending cattle in a forest of Vermaland in Sweden; and the weather being cold and wet, she carried along her tinder-box with flint and steel, as is customary in that country. Presently along came a giantess carrying a casket, which she asked the girl to keep while she went away to invite some friends to attend her daughter’s marriage. Quite thoughtlessly the girl laid her fire-steel on the casket, and when the giantess returned for the property she could not touch it, for steel is repellant to trolls, both great and small. So the herdswoman carried home the treasure-box, which was found to contain a golden crown and other valuables.[60] The heathen Northmen believed in the existence of a race of dwarfish artisans, who were skilled in the working of metals, and who fashioned implements of warfare in their subterranean workshops. These dwarfs were also thought to inhabit isolated rocks; and according to a popular notion, if a man chanced to encounter one of them, and quickly threw a piece of steel between him and his habitation, he could thereby prevent the dwarf from returning home, and could exact of him whatever he desired.[61] Among French Canadians, fireflies are viewed with superstitious eyes as luminous imps of evil, and iron and steel are the most potent safeguards against them; a knife or needle stuck into the nearest fence is thought to amply protect the belated wayfarer against these insects, for they will either do themselves injury upon the former, or will become so exhausted in endeavoring to pass through the needle’s eye as to render them temporarily harmless.[62] Such waifs and strays of popular credulity may seem most trivial, yet they serve to illustrate the ancient and widely diffused belief in the traditional qualities ascribed to certain metals. One widely prevalent theory ascribed to iron a meteoric origin, but the different nations of antiquity were wont to attribute its discovery or invention to some favorite deity or mythological personage; Osiris was thus honored by the Egyptians, Vulcan by the Romans, and Wodan or Odin by the Teutons.