A clerk once found a toad which had a round knob on its head, wherefore he thought that there must be a toad-stone. So he took up the toad and tied it firmly in the sleeve of his coat. When he returned from the fields and searched for the toad he found it not, although the sleeve of his coat was tightly bound below and he could not discover any opening through which the creature could have passed. This shows us that it is a great help to prisoners in jail.
Another early authority, Thomas de Cantimpré, says of the toad-stone:
If one take the stone from a living and still quivering toad a little eye can be seen in the substance; but if it be taken from a toad that has been some time dead, the poison of the creature will have already destroyed this little eye and spoiled the stone.
If the toad-stone be swallowed at meal-time it passes through the system and carries off all impurities.[[329]] Here the substance may have been one of many concretionary materials,—bauxite, impure pearls, concretionary limestone, stalagmite, or even the eye-stones from the crawfish; indeed, any material, white or gray, that had a semblance to a toad color, and was then sold by the vendor of charm stones as coming from a toad’s head.
The great Erasmus (1465–1536) made a pilgrimage to the famous shrine of the Virgin in the church at Walsingham, in Kent. In his description of what he saw there he expressly notes a wonderful toad-stone:
At the feet of the Virgin is a gem for which there is as yet no Latin or Greek name. The French have named it after the toad [crapaudine], because it represents so perfectly the figure of a toad that no art could do this so well. The miracle is all the greater that the stone is so small, and that the exterior surface has not the form of a toad, the image showing through it as though inclosed within.[[330]]
As we see, the stone of Erasmus contained the form or image of a toad. This was not usually the case with the concretions that bore this name, and it appears probable that the “crapaudine” of the shrine at Walsingham owed its peculiarity rather to art than to nature. A rather far-fetched explanation of the origin of these substances is given by Ambrosianus, who relates that, in order to investigate the quality and character of toad-stones, he killed a number of toads and took out their brains. Although these were not hard when extracted, they became, in time, as hard as stones.[[331]]
A toad-stone which appeared to represent the form of this animal was preserved as an heirloom in the Lemnian family. It exceeded the size of a walnut and was often seen to dissipate the swelling caused by the bite of a venomous creature in any part of the body, if it were rubbed quickly over the swelling. It, therefore, seemed to possess the same quality as was attributed to the animal from which it was taken, namely, to draw out and annul all poisons. If any neighbor of the Lemnian family were bitten by a mouse, a spider, a dormouse, a wasp, a beetle, or any such creature, he soon sought the aid of this stone.[[332]]
We have noted De Boot’s unsuccessful attempt to secure a toad-stone, but he does not seem to have used the orthodox method for obtaining it. According to one authority,[[333]] the creature should be placed in a cage covered with a red cloth and then set in the hot sunshine for several days, until thirst forced the poor toad to eject his precious stone, which was to be removed as soon as possible lest it should be swallowed again. Another method proposed is so cruel that it is a comfort to know that the whole matter is little more than a fanciful conceit. In this case, the toad was to be enclosed in a pot with many perforations, and the vessel with its unlucky inmate was then to be placed in an ant-hill and left there until nothing remained of the toad except his bones and the coveted stone. It is quite probable that any stone found in an ant-hill after this procedure would be termed a “toad-stone,” since the toad was put away in order to find one. In some instances they may have been bony concretions from the head of the toad, or even pebbles that the toad had swallowed.
While it is quite possible that some of the so-called toad-stones may really have been concretions found in the head of the toad, by far the greater part were probably small pebbles sold as “toad-stones” to those who believed in the magic virtues of such a stone and were ready to pay a good price for one. Where there is a demand there will always be a supply, and the rarer the genuine article is, the greater is the incentive to imitation or substitution. In the case of some of these “toad-stones” set in rings to serve as amulets, the material has been found to be the fossil palatal tooth of the ray, a species of fish.[[334]]