Tales About the Properties and Powers of Snake Stones

Francisco Redi describes the extraordinary healing power attributed to stones obtained from the heads of certain serpents, called by the Portuguese "cobras de capello," found throughout Hindostan and Farther India. These stones are claimed to be an infallible remedy for the bites and stings of all kinds of venomous reptiles or animals, and likewise for wounds made by poisoned arrows, etc. He repeats the usual tales of their adhering powerfully when applied to the bite or wound, and clinging to it like a cupping-glass until they had absorbed all the poison, when they would fall off spontaneously, leaving the man or animal sound and free. Then follows the account of steeping the stones in milk to remove the poison, the milk assuming a color between yellow and green. These wonderful stones and the narrations concerning them had been brought to Italy by Catholic missionaries, who seemed to have entire faith in their powers; so that Redi says they offered to prove the accounts by any number of experiments, such as would satisfy the most incredulous, and prove to medical men that Galen was correct when he wrote (Chapter XIV, Book I) that certain medicines attract poison as the magnet does iron. For this purpose a search for vipers, etc., was recommended; but, owing to the season being later and colder than usual, none could at that time be obtained, as they had not emerged from their winter quarters. An experiment was therefore substituted, after much consultation among the learned men of the Academy of Pisa, whereby oil of tobacco was introduced into the leg of a rooster. This was regarded as one of the most fatal of such substances, and was administered by impregnating a thread with it to the width of four fingers and drawing it through the punctured wound. One of the monks forthwith applied the stone, which behaved in the regular manner described. The bird did not recover, but it survived eight hours, to the admiration of the monks and other spectators of the experiment.

Redi states that he himself possessed some of these stones, as did also Vincent Sandrinus, one of the most learned herbalists of Pisa. Redi describes them as "always lenticular in form, varying somewhat in size, but in general about as large as a farthing, more or less. In color some are black, others white, others black, with an ashy hue on one side or both," etc.

Up to the present time no one has apparently identified what Tavernier referred to in speaking of snake-stones. It, however, occurred to the writer, after receiving a quantity of tabasheer from Dr. F. H. Mallet of the Geological Survey of India, who obtained it at the bazaar of the Calcutta Fair in November of 1888, that many, if not most of the Hindu snake-stones must have been tabasheer. Tabasheer is a variety of opal that is found in the joints of certain species of bamboo in Hindostan, Burmah, and South America; it is originally a juice, which by evaporation changes into a mucilaginous state, then becomes a solid substance. It ranges from translucent to opaque in color, and is either white or bluish-white by reflected light, and pale yellow or slight sherry red by transmitted light. Upon fracture it breaks into irregular pieces like starch. As in Tavernier's account of its clinging to the palate and causing water to boil when immersed, it actually has the property of strongly adhering to the tongue, and when put into water emits rapid streams of minute bubbles of air. It has a strong siliceous odor, but after absorbing an equal bulk of water becomes transparent like a Colorado hydrophane described by the writer several years ago before the New York Academy of Sciences.

Although tabasheer is mentioned in nearly all the text-books, very little of it has reached the United States. It is highly interesting, since we have here an organic product scarcely to be distinguished from a similar opal-like body found by Mr. Arnold Hague in the geysers of the Yellow-stone Park. Both tabasheer and the hydrophane were probably what was called "Oculus Beli," "Oculus Mundi," and "Lapis mutabilis" by Thomas Nicol, Robert Boyle, and other writers of the seventeenth century, and "Weltauge" by the Germans.

The great capacity of this substance for absorbing a fluid would undoubtedly render it as efficacious for the purpose of absorbing poison as any other known stone, providing the wound were open enough; and its internal use to-day as a medicine is possibly also due to this property.

Tabasheer, as known among mineralogists, is a corruption of the word tabixir, a name which was used even in the time of Avicenna, the Grand Vizier and body surgeon of the Sultan of Persia in the tenth century. It played a very important part in medicine during the Middle Ages. As to its origin, Sir David Brewster says that tabasheer is only formed in diseased or injured bamboo joints or stalks.

Guibourt differs from Brewster, inasmuch as he attributes the different rates of growth to the fact that when there is a superabundance of sap the tabasheer is formed from the residuum. More recently, Henry Cecil says, "In the onrush of tropical growth in the young shoot, nature, after flooring the knot, has poured in, as it were, sap and silica sufficient for a normal length and width of stem to the knot next above it. But by some check to the impulse, or by irregularity of conditions, the portion of stem thus provided for is shorter or narrower than intended, and the unused silica is left behind as a sediment, compacted by the drying residuum sap."

This latter view is sustained by Dr. Ernst Huth, who discusses the name, history, origin, and reputed virtues of this substance with much fulness. In regard to its use in medicine during the Middle Ages, he quotes a remarkable list of applications to the ills that flesh is heir to.

Here it is cited as a remedy for affections of the eyes, the chest, and of the stomach, for coughs, fevers, and biliary complaints, and especially for melancholia arising from solitude, dread of the past, and fears for the future. Other writers speak of its use in bilious fevers and dysentery, internal and external heat, and injuries and maladies.

The writer has examined a large number of so-called madstones, and they have all proved to be an aluminous shale or other absorptive substance. But tabasheer possesses absorptive properties to a greater degree than any other of the mineral substances examined, and it is strange that it has never been mentioned as being used as an antidote. It may be confidently recommended to the credence of any person who may desire to believe in a madstone.

The writer believes that Tavernier's snake-stones may all have been tabasheer, or again, while some of them were of this substance, others may have been artificially compounded by the authorized dealers of the Brahmin caste. The instance he gives of the successful use of such a stone is not altogether incredible, as, should one of the less active poisons be sucked out of a wound shortly after this were inflicted, a cure might well be effected. In view of the great difference in the virulence of poisons and the varying degrees of the sensibility to toxic effects, it is not strange that the snake-stones should sometimes seem to give good results. Tavernier states that these stones were brought to India by Portuguese soldiers returning from service in Mozambique. For successful use a pair of them were needed, so that, when applied to a snake-bite, as soon as one became saturated with the venom the other could be immediately substituted. To have them always at hand, those natives fortunate enough to own a pair of pedras de cobra carried them about in a little bag.

[There is another Stone, which is call'd the Serpent's-Stone with the hood. This is a kind of Serpent that has a kind of a hood hanging down behind the head, as it is represented in the Figure. And it is behind this hood that the Stone is found many times as big as a Puller's-egg. There are some serpents both in Afia and America of a monstrous bigness, 25 foot long; as was that, the skin whereof is kept in Batavla, which had swallow'd a Maid of 18 years of age. These Stones are not found in any of those Serpents that are not at leaft two foot long. This Stone being rubb'd against another Stone, yields a certain flime, which being drank in water by the person that has the poison in his body, powerfully drives it out. These Serpents are no-where to be found but upon the Coafts of Melinde; but for the Stones you may buy them of the Portugueze Mariners and Souldiers that come from Mozambique.]

A curious traditional belief is current in some parts of India, notably in Ceylon, to the effect that the male cobra, during the night, uses a certain luminous stone to lure its prey and to attract the female. This is probably the chlorophane, a variety of fluorite, a substance which shines with a phosphorescent light in the darkness, and this quality, quite mysterious in the eyes of the natives, may have induced them to associate the stone with the snake, the epitome of all subtlety and cunning. Serpent-stones were supposed to exist in both ancient and medieval times, and the belief in their existence is widespread among many races of mankind.

A chlorophane is also found in the microlite localities of Amelia Court House, Virginia. The writer made a series of experiments and noted that some of these specimens emit a phosphorescent light at a low temperature. The material occurs in Siberia, and Pallas describes a specimen from this locality. When subjected to the heat of the hand, it gave out a white light, in boiling water a green light, and when placed on a burning coal a brilliant emerald-green light, visible at a considerable distance. Similar phenomena have been observed by the writer, who has found that very slight attrition, even the rubbing of one specimen against another in the dark, will produce phosphorescence.