“To give an exact and particular account of the Nature and Manner of acting of Poisons is no easy matter; but to Discourse more intelligibly of them than authors have hitherto done, not very difficult.”
(From Dr. Richard Mead’s Preface to his “Essays on Poisons,” 1702.)
It has been shown elsewhere (Vol. I., page 52) how intimate was the connection between ancient pharmacy and poisoning. In Greek the terms came to be almost synonymous, and there is an echo of the same association of ideas in the words Poison and Potion, which a few centuries ago were used in English without much distinction.
The priests of Egypt, the Æsculapians of Greece, and perhaps still more the herbalists of that country and of Italy, necessarily learnt many things from their studies of medicinal plants. They found herbs which would cause sleep, furnish dreams, and confuse the brain. They professed and perhaps believed in their ability to accomplish far more with their philtres than the vegetable world was capable of, but the common people had no means of checking their claims, and such science as there was tended to support them. In the palaces of kings, in the tents of generals, and in all the high places where intrigues, jealousies, and enmities found their fullest scope, pharmaceutical skill was much sought after; in some cases to dispose of rivals, but more usually to counteract the murderous schemes which in those times constituted so large a portion of statecraft. There was nothing the brave men of old dreaded so much as secret poisoning. It is impossible to say how far this crime was practised. Suspicion and terror may have exaggerated its records, but on the other hand it is equally possible that thousands of deaths may have occurred from poisons which were not attributed to that cause.
Hecate and her daughters Medea and Circe figured prominently in Greek legends as inventors and discoverers of poisons. The magic arts for which they were all famous were closely associated with deadly drugs. They were supposed to live in the island of Colchis, the name of which still recalls a vegetable which for many centuries retained the reputation of possessing the most venomous properties. Colchicum was discovered by Medea, but to Hecate is attributed the earliest use of aconite.
Kings studied pharmacy and invented antidotes. Orpheus, the physician and poet, who preceded Æsculapius, wrote a poem on precious stones, in which he relates that Theodomas, son of Priam, King of Troy, had learned how to administer these as antidotes to poisons. The marvellous properties of the antidote invented by Mithridates, King of Pontus, is one of the commonplaces of medical history. Down to the seventeenth century theriaca, emeralds, and bezoar stones were the antidotes to all poisons recognised by the faculty.
No case of poisoning either suicidal, murderous, or accidental, is alluded to in the Bible, unless we regard the story of the wild gourds (2 Kings, ch. iv, v. 39) as coming within the last description. The suicide by poison of Ptolemeus Macron is mentioned in 2 Maccabees, ch. x, v. 13, but though this was a frequent practice among the Greeks and Romans when the New Testament was written, no allusion to it is found in the sacred writings. It may be that the apostles who include “pharmakeia” among the crimes of the heathen had in mind the degradation of the art to homicidal purposes, but it is more likely that they only intended to denounce its application to the service of lust or its consequences.
The word Rosh occurs eleven times in the Old Testament, and is usually rendered gall, often in association with wormwood. In two instances, however (Hosea, ch. x, v. 4, and Amos, ch. vi. v. 12), it is translated hemlock in the authorised version, and this is retained in the revised version for the passage in Hosea. Apparently the word was a generic one for pernicious or nauseous weeds; but as Rosh also means head some commentators have thought that the poppy was intended.
The word translated poison in Deut. ch. xxxii, v. 24, Job, ch. vi, v. 4, Psalms, lviii, v. 4, and cxl, v. 3, is Chemah, and always means something burning. It is often used to indicate fierce anger. The verse mentioned in Job is obviously a reference to the very ancient practice of dipping arrows into some poison, an application of pharmacy from which we derive our term toxicology.
Livy tells the story of the earliest of the poison leagues. He is dependent on older historians for his facts, as the alleged events happened some three centuries before he wrote; about the year 330 B.C. in fact. A number of patricians died one after the other, their illnesses presenting similar symptoms, but the causes of these could not be traced. At last, however, a female slave gave information to the Ediles of a group of twenty Roman ladies of the highest position who, she said, occupied themselves in concocting poisons, and administering them to their husbands or others who had become inconvenient to them. The confederacy was directed by two women named Cornelia and Sergia, and although Livy says 20, some accounts give the number of the conspiratresses as 170, while others total it at 366. Cornelia and Sergia were brought before the magistrates, and indignantly denied that they had done more than prepare wholesome beverages and medicines. On this the slave, whose own life was in jeopardy, demanded that they should themselves be required to take some of these compounds. They were granted permission to consult with their associates before doing this, and in the interval they all poisoned themselves. Livy states that this story is not told by all the contemporary narrators.
Later Roman history leaves little doubt that poisoning became a profession, or rather was frequently associated with the pharmacy of the period, as it had been in Greece. Theophrastus, who wrote about 300 B.C., alludes to a poison prepared from aconite which could be so administered as to take effect at a defined future time, three months, six months, a year, or longer after it was taken, the victim gradually growing weaker. It was perhaps in consequence of this belief that the possession or cultivation of aconite was made a capital offence. Pliny states that Calpurnia Bastia, one of the Catiline conspirators, was poisoned by aconite.
Locusta was one of the noted poison compounders of the Roman empire. She had been condemned to death in the reign of Claudius, but probably by the influence of the Empress Agrippina, she was pardoned and was employed by that infamous woman. Claudius was getting on in years, and was showing more affection for his own son Britannicus than for his stepson Nero, whom at the solicitation of Agrippina he had adopted and made his heir. The empress therefore resolved to get rid of Claudius, but she was afraid to use a suddenly acting agent, and Locusta was ordered to compound something which should produce a fatal effect, but not immediately. It was to be so compounded that it would destroy the emperor’s reason lest in the course of his proposed illness he should take measures to supplant Nero by Britannicus. Locusta had to pretend to be able to fulfil this commission, and the poison she prepared was mixed in a dish of mushrooms. Claudius having eaten some of these was soon taken ill and had to be carried from the table, but as this was what usually occurred at his dinner not much notice was taken of the event. His physician gave him an emetic, and he was in a fair way to recover, but Agrippina, frightened at the possible exposure, employed another minion to apply more of Locusta’s poison on a feather to his throat, under the pretence of making him vomit more. He soon died. Tacitus and Suetonius relate how Nero used Locusta later to help him rid himself of Britannicus, and also of his old tutor Burrhus, who had wearied him with his remonstrances. Locusta was executed in the reign of Galba A.D. 68.
Among other famous Romans believed to have perished by poison were Germanicus and Drusus. Caligula ordered a deadly ointment to be given to an impolitic gladiator named Columbus, who had unwisely worsted the emperor with the fencing foils, to be applied to his wounds. The poor wretch died in consequence. These are only samples of Roman poisonings.
The poisons known to the ancients cannot be with certainty identified. The one to which the power of philtres was principally attributed was mandragora, which was said to produce various hallucinations and temporary madness. It is most likely, however, that in many of the cases where this drug is named the poison actually used was belladonna root. Hannibal, fighting against a large army of African rebels, simulated retreat, but left on the field of battle a quantity of vases of wine in which “mandragora” had been infused. The savages drank the wine, which reduced them to a condition of stupor. Then the Carthaginian hero returned and gained an easy victory over his helpless foes. Henbane seeds infused in wine made the head light, and gave the impression of having travelled through the air. Stramonium, dulcamara, hellebore, opium, Indian hemp, vervain, mezereon, and many other drugs, were in the stock-in-trade of the philtre mongers and conjurers, and the legends related by Pliny and others about the properties possessed by these herbs are sometimes nonsense, but are too often based on their real powers.
There was a ranunculus which grew in Sardinia, which was credited with the power of promoting gaiety. It was called the Herba Sardonica. It occasioned spasmodic contraction of the muscles of the face and so simulated a laugh. Hence our expression “sardonic grin.” The employment of haschish by the Saracen warriors to make themselves fierce and reckless in battle is not a mere legend. The sect who introduced it in the armies of Islam were called hashashin, the origin of our word “assassins.” The reputation of the myrtle as an invigorator of the brain, and its consequent adoption by poets as a garland round their brows, is a sample of a more innocent tradition.
Several of the Greek and Roman medical authors, Galen among others, profess a cautious reticence in regard to poisons. But there is a treatise in existence in verse, by Nicandor, which gives such toxological knowledge as was familiar to the men of science of the second century before the Christian era. Among venomous animals were included salamanders, leeches, toads, cantharides, and the sea-hare (Lepus marinus). The blood of bulls (probably putrefied) was a poison in use by the Athenians. The honey of Heracleus had a certain fame, for it was alleged that the soldiers of Xenophon having regaled themselves with this luxury were all so intoxicated with it that the whole army lay on the field as if they were dead. Next day all recovered. It is supposed to have been a honey extracted from narcotic flowers.
The vegetable poisons known to the ancients have mostly been named. But cherry laurel, elaterium, certain fungi, and smilax, probably our mezereon, should be added. The mineral poisons in more or less use were arsenic, in the form of orpiment and realgar, cinnabar, and metallic mercury, which was reputed to be poisonous. Nicandor alludes to litharge, ceruse, and gypsum. By the last he may have meant quicklime. Berthelot translated from Olympiodorus (sixth century) the description of a process for making white arsenic from the sulphide. The product was called “alum, white and compact.” The animal kingdom furnished the Romans with at least one famous poison which they extracted from the Lepidus marinus (in the Linnean system, Aplysia depilans) which they knew as the sea-horse. According to Philostratus it was by this poison that Domitian removed Titus.
The belief in the skill of the compounders of philtres and mysterious charms grew rather than diminished in the Middle Ages and as alchemy developed. In Sir Walter Scott’s “Talisman,” the tale of the Crusades, the western physician says, “The oily Saracens are curious in the art of poisons, and can so temper them that they shall be weeks in acting upon the party, during which time the perpetrator has leisure to escape. They can impregnate cloth and leather, nay, even paper and parchment, with the most vile and subtle venoms.”
Official records of the trial of a minstrel named Wondreton in Paris, in 1384, give a copy of instructions alleged to have been given to the accused by Charles the Bad, King of Navarre, who had employed this Wondreton to poison the then King of France, Charles VI, his brother, two uncles, and several dukes. The scheme was extraordinarily crude, although Charles the Bad was reputed to be an adept in alchemy. The minstrel was to buy “arsenic sublimat” from the hotels of the apothecaries in Pampeluna, Bordeaux, Bayonne, and other towns through which he would pass. He was to powder this, and get into the kitchens of the eminent persons who were to be his victims, and then, when he could do it with safety, he was to sprinkle some of the powder in the soups and meats served to the masters. Wondreton was arrested before he had done any mischief, and was executed.
King John of England is alleged to have caused Maud Fitzwalter to be killed in the Tower by a poisoned egg because she would not yield to his illicit passion.
The sorcery practised so largely in the Middle Ages must have frequently developed into poisoning. The philtres were to a large extent the same as those which the Romans had used. Opium, belladonna, datura, Cannabis Indica, and arsenic were capable of producing astonishing effects, and there was but little chance of detection except the chance which was just as likely to result in the conviction of an innocent as a guilty person. Poisons, or at least the terror of them, played a considerable part in the history of Italy in the fifteenth and sixteenth centuries, and the country acquired the nickname of Venenosa Italia. Even earlier the famous Venetian “Council of Ten” was believed to have made a systematic business of assassination by poison. It employed experts and had a regular tariff—so much for a king, so much for a duke and downwards, which was allowed, plus expenses. The crime having been accomplished, the books of the Council recorded the fee, and the single word “factum” was added. The Medicis and the Borgias, and other of the great aristocrats of the nation are supposed to have kept skilled poisoners in their pay. Giambaptista Porta, Mercurialis, and other scientific men wrote treatises on toxicology as it was understood at the period, coloured with exaggerated fancies such as would impress the common public, and tempt the criminally inclined. Porta, for example, describes the “magic unction” which witches were believed to employ. It was this which gave them power to fly through the air. He attributes this virtue to belladonna. With dulcamara they made a drugged cheese which they gave to travellers, and which had the effect of inducing the victims to fancy themselves beasts of burden. In this condition the adepts could set them to any work they wanted done, and, this performed, they gave them an antidote which restored them to their proper senses.
Terror of poisons became epidemic in many countries, and eager credulity welcomed any alleged antidote. Ambrose Paré relates an incident in which he was an actor. He, a Protestant, was principal physician to Charles IX, the wretched author of the Massacre of St. Bartholomew. His story of the experiment which that king had made with a bezoar stone is related on page 18. There was also an Archduke Ferdinand of Austria who in the same century invented an antidote to poisons. It was composed of sapphire, hyacinth, emerald, ruby, and garnet. He also, according to Matthiolus, tried an experiment similar to the one narrated by Paré. A Bohemian, condemned to be hanged, was given 2 grains of arsenic. In four hours he had become livid, prostrate, and apparently dying. He was given a dose of Ferdinand’s powder in a glass of white wine, and recovered. Matthiolus also states that Pope Clement VII made such experiments on condemned criminals.
In the reign of Henry VIII of England in 1530 an Act was passed making the crime of poisoning punishable by boiling alive. This was enacted in consequence of several deaths believed to have been due to poisons which had occurred in the household of the Bishop of Rochester. In 1542 it is recorded in the chronicles of the time that a young woman named Margaret Davie was “boyled alive in Smithfield” for having poisoned persons in three houses in which she had lived. The savage punishment was reduced to hanging in 1547 in the reign of Edward VI. In Queen Elizabeth’s reign in 1598 two men were hanged on a charge of having placed poison in her saddle.
Italian poisoners are alleged to have found abundant employment in France. Catherine de Medici took with her to Paris her astrologer, Cosmo Ruggieri, and the people believed that he was responsible for the death of Charles IX. The ambitious queen has found many defenders, but the fiend capable of planning the massacre of St. Bartholomew may support a few extra crimes. Exili went to Paris in the next century with the reputation of having poisoned 150 persons in Rome. Michelet says this miscreant had been in the employment of Marie Olympia, Queen of Rome under Innocent X, and implies that it was on her account that he exercised his chemical skill. He had also been in the service of Queen Christina of Sweden, but this employment was apparently not a criminal one. The latter queen had only engaged Exili to instruct her in alchemy. It was from this teacher that the famous poisoners of Paris were alleged to have learned their arts. It is not possible, however, to ascertain the limits of exaggeration in the accounts which gossiping chroniclers give of that epoch. Royal edicts were issued forbidding “all sorts of sorcery or magic, divinations, philtres, invocations of demons, drinks to win love, enchantments to trouble the air or excite hail or tempests, to destroy the fruits of the earth or the milk of beasts, mathematics [which meant astrology], auguries, and interpretations of dreams.” But though the practice of the “diabolic arts” was punishable by death, it flourished abundantly, but it is not necessary to accept the estimate of a diarist named L’Estoile, who, describing the execution of a witch named La Miraille in 1587, stated that the number of such persons in Paris at that date exceeded thirty thousand.
Perfumery and the publication of almanacks were businesses which covered many of the malfeasances struck at in the edict just quoted, and no doubt there was a widespread belief in the miraculous toxicological skill of the fortune tellers, who naturally wished their predictions to be verified. “Tasters” were employed in the houses of the wealthy, dishes of “electron” which it was believed would tarnish if poisons were placed on them, and Venetian glass, which was warranted to fly into atoms if the wine poured into it had been contaminated, were in frequent use. As Rogers has written
But probably nine-tenths of the crimes suspected were the mere result of the disordered fancies of the age. Knowing as we do on what frivolous evidence women were condemned as witches, it is permissible to be sceptical in regard to the testimony received by the frightened judges when one of these notorious criminals came before them. Nor are the alleged confessions of the women themselves necessarily conclusive. The so-called witches often supplied details of their negotiations with Satan, and of their Sabbatic excursions; and hysterical women in all ages have been addicted to the relation of fictitious narratives circumstantially describing both their vicious and their virtuous exploits. The rapid putrefaction of a corpse was considered to be sufficient evidence that the cause of death had been poison, though it is likely that the poisons then in use would have tended to preserve the body.
was one of the most interesting of the historic poisoners. She was the daughter of the civil lieutenant of Paris, Dreux d’Aubray, and her career as a criminal coincides with the early years of Louis XIV’s reign. She is described as elegant, “petite,” sweet in her disposition, and modest in her demeanour. According to her own confessions, produced at her trial, sometimes admitted, and sometimes denied by her (and characterised by Michelet as confused and impossible, and probably composed under the influence of fever), she commenced her career of crime at the age of 7 years by incestuous intercourse with her brother. She accused herself also of arson. She married the Marquis de Brinvilliers when she was about 20, and after helping him to dissipate their joint fortune, she obtained an order of separation as far as property was concerned, but continued to live with him as well as with his intimate friend, a sinister person who called himself Ste. Croix, and professed to have been a cavalry officer. His real name was Godin, and Michelet, who investigated all the court documents dealing with the case, makes him apparently the agent, and ultimately the victim, of an arch-fiend of the name of Penautier, a cleric who at least profited largely by the sudden deaths of various persons. He describes Ste. Croix as a person of austere manners and as the author of some ascetic books. Penautier was never formally accused, and it is not easy to disentangle the intrigues associated with the case. Whatever these may have been, Madame’s father, disgusted with the scandal created, got Ste. Croix placed in the Bastille. There it is alleged he met with the notorious Italian poisoner, Exili, and learned from him a number of poison secrets, though it is doubtful if the art was a new one to him. Perhaps Penautier got him released; anyhow he went in to the Bastille poor, and came out rich. He married and set up a fine establishment. But he still continued his liaison with the marchioness. During his imprisonment that lady had occupied herself in visiting and consoling patients in the hospitals. Now, according to the usual story, she made use of them by giving them poisoned confectionery, and watching the effects, merely for practice. Then she began to dose her father. His illness lasted eight months, his murderess nursing him tenderly meanwhile. Two brothers were also victims, and then she planned the death of her husband, but according to Mme. de Sévigné her accomplice, Ste. Croix, saved him by providing an antidote. The marquis lived to see his wife punished, but was one of those who exerted himself to get a pardon for her. Ste. Croix next died suddenly, in consequence, it is said, of his accidentally dropping a glass mask which he wore when compounding his poisons. This story, says Michelet, is a fable. A case of poisons in packets was found in his rooms, each neatly labelled with its effects. These, it was alleged, were addressed to the marchioness, who managed to escape to England, Penautier giving her letters of credit, says Michelet. Michelet says the packets of poison were addressed to Penautier. The marchioness was soon after taken at a convent at Liège by a detective who, pretending to be an Abbé, made love to her and induced her to go for a walk with him, when lie handed her over to his men, who took her to Paris. She was tortured (only formally, says Michelet), convicted, marched to Notre Dame with a rope round her neck to make the “amende honorable,” then decapitated, and her body burned.
One of the witnesses at her trial declared that the marchioness once showed her a little box containing some white stuff, and said there were a number of successions in that little parcel. The witness said she was the daughter of an apothecary and recognised that the substance shown her was sublimate.
It has been discussed by experts whether the poison on which Ste. Croix and his mistress chiefly relied was arsenic or sublimate. Most likely it was arsenic. A certain Guy Simon, an apothecary, was employed to experiment with it, and to discover its composition if possible. His report is worth quoting at some length as an illustration of the condition of toxicological science at that period, and incidentally of the simple faith in the almost miraculous powers of the poisoners which evidently possessed all classes at that time.
According to Chapuis (“Traité de Toxicologie”), Simon at first dropped a little of the liquor in the phials on oil of tartar and sea water, but nothing was precipitated. Then he digested some of it in a mattrass on a sand-bath, but on distilling it no substance of acid or acrid taste was yielded, and no fixed salts were left. Having poisoned a pigeon, a dog, and a fowl with the liquid, he could only discover on opening the dead bodies a little clotted blood in the ventricule of the heart. Some of the powder deposited by the liquid was given to a cat which vomited for half an hour and then died.
Simon explains that poisons generally sink to the bottom of water, and when tested by fire the innocent part is dissipated and only the acrid and piquant principle remains. But this poison of Ste. Croix’s, floated on water, and tried by fire, left only something sweet and innocent. It in fact ruled the elements, and killed animals without leaving any trace. Utterly baffled, the expert concludes: “It is a terrible, diabolic, intangible (insaissable) poison.”
About the same time the woman Tofana was selling her Aquetta di Napoli in Italy, but she was not brought to justice until 1709, when she confessed to the Pope and the Emperor Charles VI that her drops contained arsenic, and that by them she had caused the deaths of more than six hundred persons. The Emperor repeated her story to his physician, Garelli, by whom it was communicated to Hoffmann, who published it in his “Rational Medicine.” She preferred to prepare her drops by rubbing arsenic into the broken joints of a hog just killed and then collecting the juice. Tofana took refuge in a convent and lived for some twenty years after her condemnation. A letter from the English Secretary of State to the Commissioners of Customs, dated July 29, 1717, is on record, cautioning them against admitting a liqueur called Aqua Tufania from Italy, as accounts of its dangerous character had been received from the British envoys at Naples and Genoa.
After the execution of the Marchioness of Brinvilliers, secret poisoning, far from being suppressed, appears to have become almost fashionable. The Government at least pretended to believe in widespread conspiracies. It may have been a political trick, as has been alleged, to get rid of some inconvenient opponents; but, however this may have been, a special commission was appointed by the French Government to inquire into the truth of certain rumours, and this commission acquired the title of the Chambre de Poisons, or Chambre Ardente. Louis XIV consented to the institution of this special court on learning that the notorious Ste. Croix, the coadjutor of Mme. de Brinvilliers, had at one time nearly secured the position of maître d’hôtel in his palace at Versailles. It principally concerned itself with the revelations made by two women who called themselves La Voisin and La Vigoureux, who with an unfrocked priest, who had assumed the name of Le Sage, had carried on a fortune-telling business of enormous extent in the city. They claimed the power of exhibiting the devil to their clients, and it was charged against them that they had sold a powder of succession to those who would pay for it. Many highly connected aristocrats were implicated, and some faced the commission while others left the country rather than expose themselves to the shame of exposure. La Voisin had kept records of her business, but those which were produced displayed rather the ridiculous than the criminal side of the conspiracy. The Duchesse de Foix had come to her for bosoms; Madame de Varsi wanted hips. Others had paid her fancy prices for petitions written with a special ink guaranteed to make them loved by the king. La Voisin was extremely insolent to her judges, and apparently she and her accomplices were all sentenced to be burned. According to Voltaire the sentence was executed in the case of all of them; but the account given by Madame de Sévigné, and by historians who lived nearer the period, go to show that the death punishment was only inflicted on La Voisin.
In Prestwich’s “Dissertation on Poisons” (1775) an extract is given from the “Carolina Gazette” of May 9, 1750 stating that the General Assembly, the governing body of the colony, had authorised the publication of “Negro Cæsar’s Cure for Poison.” The General Assembly had purchased Negro Cæsar’s freedom, and granted him £100 a year for life as the price of this formula. It consisted of roots of plantain and wild horehound (? of each) 3 oz. boiled together in two quarts of water down to 1 quart and strained. Of this the patient was to drink one-third every morning fasting for three consecutive mornings. Certain conditions of diet were laid down, and it was quaintly added that if after the three days’ treatment no benefit had resulted it was “a sign that the patient has either not been poisoned, or has been by such poison as Cæsar’s antidote will not remedy.”
About the middle of the 19th century some discussion took place in various popular and medical journals in reference to the alleged practice of eating arsenic in Styria and the neighbouring countries. Drs. Christison, Swaine Taylor, and Pereira were somewhat more than sceptical, but several doctors and others wrote confirming the statements from their personal knowledge. One of the most notable testimonies was contributed by Dr. Craig Maclagan of Edinburgh in the “Edinburgh Medical Journal” (1865). Dr. Maclagan had visited Styria and had introductions to several doctors in that country who had reported cases known to them. Two men were brought to Dr. Maclagan at the village of Liegist in Middle Styria, and in his presence took, one about 4½ and the other 6 grains of white arsenic. Dr. Maclagan brought home some of the substance which the Styrian doctor had given to these men, and on testing it found it to be genuine white arsenic. He also brought back some samples of the urine voided by the men some time after eating the arsenic, and found in it distinct evidence of the presence of the poison. The arsenic was taken by the men on a piece of bread, and in one case was washed down with a draught of water. How extensive was the habit, Dr. Maclagan could not say. The peasants called it Hydrach or Huttereich; the correct word was said to be hutten-rauch, furnace smoke. One of the men took his dose about twice a week, the other generally once a week. They had of course begun with doses of less than a grain. It was understood to be a tonic and stimulant, and to aid the respiration in climbing. It was also believed to promote sexual desire. Having acquired the habit the occasional dose was much missed if omitted for long.
The modern employment of serums in the treatment of zymotic diseases goes a long way towards explaining the fact of the immunity of individuals in respect to bacterial poisons. But the possibility of immunity against such poisons as arsenic, opium, or serpent venom appears to rest on a different basis. In 1896 Professor (now Sir) Thomas R. Fraser, M.D., F.R.S., reported to the Royal Institution a long investigation dealing with the alleged resistant power of certain tribes or sects in India, Africa, &c., who can suffer the bites of unquestionably venomous snakes without becoming seriously affected. After quoting numerous reports from old and recent works showing that this immunity is an actual fact, Professor Fraser described a long series of experiments extending over many years with venom which he had obtained from India, America, Africa, and Australia. The venom, he stated, is a complex substance and is not a ferment. Ascertaining the minimum lethal dose for each animal he experimented on frogs, cats, rabbits, guinea pigs, and other animals, and beginning with one-tenth, one-fifth, or one-half of that dose, and gradually increasing it, he found it possible to administer four or five times, and in the case of rabbits up to even fifty times the lethal dose. From the immunised animal a serum was prepared which was antidotal in very minute quantities if mixed with the venom, but if administered separately by hypodermic injection, though at the same moment with the venom, some twelve and a half times as much was found to be necessary, and it was estimated for a normal bite of an average man no less than 11½ ounces would have to be administered hypodermically soon after the bite to prevent probably a fatal result. The most interesting observation was that the poison taken into the stomach was almost innocuous, and yet exercised a protective effect. In many of the narratives given by travellers describing the feats of the snake charmers it has been related that they will squeeze the venom from the serpent’s mouth and swallow it. This would evidently be one of their methods of rendering themselves proof against the poison when injected by a bite. Professor Fraser’s paper is published in full in “Nature” April 16 and 23, 1896. The author gives his reasons for believing that the action of the antidote is chemical.
Systematic and scientific investigation of alleged poisoning was scarcely known before the end of the eighteenth or the beginning of the nineteenth centuries. The advance of chemical and physiological knowledge, however, was soon applied to the more certain detection of the criminal use of toxic agents. Orfila’s “Traité de Toxicologie,” published in 1814, the result of a multitude of experiments, was the work which led the way in the establishment of exact tests. Dr. Swaine Taylor in England, Sir Robert Christison in Scotland, Casper in Germany, and a host of other medical chemists pursued the subject, and gradually toxicology reached an assured position. How slow was this attainment may be gathered from the testimony of an expert in a French murder trial in 1823 that globules of fatty mutton had been mistaken for white arsenic.
To Marsh’s arsenic test, made known in 1836, may be traced the practical fall of the poison which for so many centuries had reigned supreme among the deadly agents employed by the most cowardly but most dreaded of the tribe of assassins. The power of proving the presence of the metal which was afforded by the method then set forth brought out the chemical expert, and led to angry controversies. The skilled experimenter was apt to be very confident of his results, and naturally others who claimed to be as skilful as himself disputed his conclusions. Theories of the almost universal diffusion of arsenic were vigorously maintained, and on one occasion in France, in 1839, when Orfila had demonstrated the presence of arsenic extracted from the organs of the person supposed to have been poisoned, Raspail undertook to extract as much from the judge’s armchair.
Meantime the resources of the poisoners had been vastly extended by the discovery of the alkaloids. Many of these substances possessed extreme toxic power, and the invention of the means of detecting them was necessarily a gradual process. It was attained, though; and it may be asserted that at present either by chemical or physiological tests the recognition of the administration of any of the dangerous alkaloids is as certain as is that of the metallic poisons.
About the year 1870 a new complication occurred when an Italian chemist named Dr. Selmi proved that putrefactive animal matter and certain bacteria yielded alkaloidal products, often poisonous, to which the name of ptomaines was given. Selmi was engaged as an expert in the investigation of a case in which it was suspected that an individual had been poisoned. A product was obtained, apparently an alkaloid, but which Selmi could not identify with any known vegetable substance. He came to the conclusion that it was of animal origin, and after a long series of experiments he proved his theory. Several eminent toxicologists at first asserted that ptomaines could be distinguished from vegetable alkaloids by the property of yielding Prussian blue with ferric salts. This test, however, proved fallacious as several series of vegetable alkaloids, notably the pyridic and the allylic, gave the same reaction. The distinction between animal and vegetable alkaloids is a delicate one, and has to be established by an accumulation of chemical evidence.
Leucomaines, which are also alkaloidal products, are distinguished from ptomaines by being formed in the body from living tissues, as a result of their activity. These were first separated by Armand Gautier in 1886. Their constitution is more complex than is that of the ptomaines, but they are not generally of a poisonous character.