Historic Tales of Madstones and Serpent Stones

One of the tales of the Gesta Romanorum treats of a serpent-stone of singular medicinal virtue. According to the story--which is, of course, a mere legend--a certain Theodosius, who "reigned in a Roman city," was a most prudent ruler, but was afflicted with blindness. In his care for the welfare of his subjects he had decreed that when anyone who desired justice rang the bell at the palace gate, a judge must forthwith appear and try his case. Now it happened that a serpent had its nest near the bell-rope, and one day, while the reptile was absent, a toad took possession of the nest. Returning and finding the nest occupied, the serpent,--evidently a worthy descendant of the original serpent of Paradise, "more subtle than any beast of the field,"--wound its tail about the bell-rope and pulled the bell. When the judge appeared, as in duty bound, he was struck by this strange spectacle, and reported it to the emperor, who told him to right the wrong which had been done, directing him to expel and kill the toad. Not long after, the serpent made its way into the palace and entered the emperor's room, bearing in its mouth a small stone. Proceeding to the emperor's couch, it crawled up, raised its head above the emperor's face and dropped the stone upon his eyes. As soon as the stone touched the eyes, the emperor's sight was restored. The serpent disappeared and was never seen again.

A representative type of "madstone" is a concretionary calculus occasionally, but very rarely, found in the gullet of male deer. In form it bears a resemblance to a water-worn pebble and is usually of oblong shape, the largest specimens being 3 inches in length and 1 1/2 inches in width. The chemical analysis of Dr. H. C. White showed that the chief component was tricalcic phosphate. His experiments demonstrated that while such a concretion would absorb water to the amount of 5 per cent. of its own weight, the quantity of blood or other fluid it was able to absorb only amounted to 2.3 per cent. of its weight. When immersed in water, after having been placed on a wound caused by the bite of a venomous creature, the liquid absorbed was given out so as to discolor the water, and the material exuded was found to be of toxic quality. However, experiments with animals that had been bitten by snakes or other reptiles, failed to show that the stone exercised any curative effect. Dr. White states that he has in his possession a "mad-stone" dating from 1654, but this is of a different type, being a porous sandstone.

Even in South Africa snake-stones are known, but it appears that the few specimens reported had been brought thither from the Dutch East Indies; one such stone had been handed down for generations in a Dutch settler's family. From their appearance some of these snake-stones were judged to be pieces of burnt hartshorn. A Boer farmer owned an amulet of this kind that he would loan from time to time to neighbors who might have need of it. On one occasion, when the daughter of an English hunter had been bitten by a snake, the father sent off a man on horseback to borrow this snake-stone. Owing to the unavoidable delay, some hours elapsed before it could be applied to the wound. The girl recovered after its use but the wound did not heal satisfactorily, and this was attributed to the length of time that had intervened between the attack of the snake and the use of the remedial stone.