Mercurius cyanatus

Last modified on January 1st, 2019

Proving Symptoms of homeopathy medicine Mercurius Cyanatus, described by Richard Hughes in his book, A Cyclopedia of Drug Pathogenesis, published in 1895.


Mercuric cyanide, Hg (CN)2.


1. A partial proving of the cyanide gave great prostration and weakness, a low febrile condition, a whitish – grey deposit upon the tonsils and mouth, extending along the right side of the tongue, with slightly swollen tonsils and difficult deglutition. These symptoms are given as communicated to me by the prover. These symptoms are given as communicated to me by the prover. The prostration and other symptoms were so severe that he ceased taking the drug, – the second potency had been used, – and rapidly recovered by the use of baptisia. (W. A. ALLEN, Hom. Times, Oct., 1877.).


1a. A strong healthy, man, in April, 1823, after futile attempts to take a preparation of prussic acid, swallowed about 23 1/2 gr. of cyanide of mercury. Immediately, repeated vomiting mixed with blood ensued, frequent and copious stools, and terrible pains in the whole abdomen. The patient drank mucilaginous drinks. After 4 d. Dr. Kapeler was called. The patient’s face was grave, the eyes fixed, and the conjunctiva injected. He confessed, at last, to having poisoned himself in the above – mentioned way. The exterior of the body showed nothing remarkable, except a dark blue discoloration of the scrotum and of the semi – erected penis. Terrible headache; strong heart – beat; rather slow, but full, hard and even pulse; free respiration; slight cough; normal resonance of the chest. Lips, tongue, and inner surface of cheeks studded with numerous ulcers covered with a grayish pulp; salivary glands swollen; ptyalism; swallowing difficult, continued nausea, and frequent vomiting after drinking; great thirst. Abdomen soft, not sensitive to pressure; frequent urgent to stool, with tenesmus; stools infrequent and mixed with blood; suppressed urination. (twenty leeches to the anus; veal – broth as a drink; injection of bran – water; boiled barely and honey for gargling.) On the following day the condition was the same. (Thirty leeches and poultices to the abdomen.) On the 6th day none of the symptoms had abated; the condition of the mouth was the same; vomiting, tenesmus, and suppression of urine continued; the abdomen soft, not painful on pressure; the heart – beats violent and strong; the pulse unchanged. (Venesection.) Restless, sleepless night; when in a warm bath the anxiety ceases. On the 7th day the heart – beat not so strong; pulse a little weaker; salivation less profuse; the condition of mouth and other symptoms unchanged. (Thirty leeches.) During day the patient is quiet, and only complains of pain in the mouth; slight convulsions in the extremities. On the 8th day general weakness, frequent fainting, somnolency, vomiting less frequent, suppression of urine; the semi – erected state of the penis also continues, and the purplish hue. In the evening slow contracted pulse, cold extremities, hiccough. On the 9th day condition the same. Extreme weakness, and fainting attacks. Continued hiccough. At 2:30 died in a fainting attack. 1b. Post – mortem examination 20 hours after death. External condition: Well developed body, dull pallor of the skin, upper and lower extremities rigid and contracted so that the body only rests upon the back; the muscles red, very large, nd covered with a thick layer of fat. Larynx, trachea and bronchial contain much whitish phlegm, a part of which flowed from the nose; the pleural cavities contain several grammes of pinkish serum; the lungs somewhat pink, healthy, and crepitating; wherever a cut is made, much serum flows out. Circulatory system: On making a cut into the skin, muscles, or blood – vessels, pale and very fluid blood flows out. The inferior vena cava is filled with a very large, elastic and tough coagulum; the heart, embedded in fat, appears a little larger than normal, without having hypertrophied walls; but little blood in either ventricle; fibrous coagula in the right auricle. Digestive organs: Peculiar stinking odour from the mouth. Inner surface of cheeks and the gums are covered with ulcers, having a grayish coating; the tongue thicker than normal, ulcerated on its edges, and covered with a very thick dry coating, hard to remove. The pharynx is normal; in the middle of the oesophagus an ecchymosed pink spot the size of a thaler. The peritoneal cavity contains some yellowish serum. The stomach is of moderate size, and externally normal; the intestines distended by gas. The mucous membrane is bluish red in the small curvature; in the cardiac portion and large curvature dark red, exceedingly tumefied, and covered with ramifications of blood – vessels. In the duodenum and jejunum it is very much tumefied, dark red, in some spots quite black, and in others gangrenous. The redness the same in the caecum; pale in the ascending colon, more red in the transverse colon, less in the descending colon, and again darker in the rectum. The mucous membrane throughout the intestines is swollen, and in some portions, particularly in the small intestines, granulated. In all places where the membrane is raised in this manner, there is marked infiltration of serum into the submucous connective tissue. The pancreas is very large, hard, dry, easily torn, and creaks under the scalpel. The liver is enlarged, but the substance shows very little change. The gall – bladder contains a blackish – green, stingy, pitchy fluid. The spleen is small, otherwise normal. Uropoietic organs: The right kidney is a third larger than normal, its substance is pale; the left is a little smaller and less pale than the r. The bladder is small, contracted, containing a very small quantity of milky urine. The penis semi – erected, and, like the scrotum, of a purplish hue. The skull and spinal column were not opened. Neither in the blood nor in the excrements could M. be found chemically. (ORFILA, Toxicologie.) 2. A student took at 10. p. m. on Dec. 3rd, after drinking 3 glasses of beer, 2 gr. of cyanide of mercury in a fourth of another glass. He had not taken solid food for 7 or 8 h. Immediately, nausea followed by vomiting. In about 10 m. continuous vomiting was added, violent urging to stool, soon followed by evacuations. Vomiting and diarrhoea now alternated until 10 a. m. During this time he may have bad 30 to 40 attacks of vomiting and diarrhoea. To these symptoms were added bitter taste, violent colic increased with every evacuation, vertigo, headache, and great chilliness. 4th, 11 a. m. – The patient’s face cyanotic; pupils widely dilated; extremities cold; pulse weak, 130; tongue clean; abdomen not distended, and not painful to the touch. Lungs and heart unaffected, only the heart’s impulse and sounds very weak. Urine not passed with the stools. Prescription: milk, mucilaginous drinks, cold applications to head. In evening vomiting had completely stopped. There were two thin evacuations tinged with blood; these were without urination. Pulse 132, small; cyanosis somewhat less. 5th. – Patient slept all n. On waking violent headache; increased nausea and thirst; difficulty in swallowing; entire lining of the fauces highly inflamed; evacuations had ceased; bladder empty. Pulse 102, irregular; pupils somewhat more contracted. Same prescription patient slept much during evening; had no evacuation. Pulse 92. 6th. – Had a good sleep; pulse 90; tongue thickly coated, but no vomiting and evacuations; otherwise the same. 7th. – In n. vomited 20 or 30 times, with increased bitter taste. The matter vomited consisted of a whitish, turbid, slimy mass, of alkaline reaction, without any marked odour. Tongue moist and coated; no evacuation; bladder empty. Pulse 88; profuse nose – bleed. Headache and vertigo continued. Ice pill and an injection. After first spoonful of med. vomiting again; the injection was followed by two dark faecal evacuations slightly tinged with blood; no urine. Pulse 90. Slight nose – bleed, otherwise the same. 8th. – In n. violent vomiting twice of much dark blood, a dark faecal stool; slight thirst, no appetite; tongue thickly coated; formation of vesicles on left border of tongue, also on left side of soft palate; swallowing remains difficult; pulse 90, and regular; but little nose – bleed; no urine, no sweats. There was no urination up to the 10th, when, during an attack of nose – bleed, there was urging to micturate, and the urine passed in bed. The urine, which was collected on the 11th day, had an acid reaction; the quantity was too small to take the specific gravity. Microscopical examination showed numerous straight and twisted tubuli covered with finely grained detritus; no blood – corpuscles. A chemical analysis disclosed much albumen. Once or twice a day, attacks of nose – bleed, alternating with vomiting, up to the 17th ; also a daily increase of urine. On the 18th no nose – bleed, and no more albumen in tubuli of urine, which was now copious. Pulse 54; tongue still thickly coated. On 20th and 21st no nose – bleed; the tongue, for the first time, moist and clean; taste and appetite improved; pulse 88, intermitting. On 22nd, no more vomiting, but also no evacuation in spite of three injections. Same condition on 23rd. Another injection on 24th brought a copious normal evacuation. Soup and gruel were well received. On 25th decidedly convalescent, with a remaining tendency to constipation for several day (MOOSE, Virchow’s Archiv, 1864.)

3. Mr. H -, aet. 19, architect, weakly, nervous constitution, several hours after eating a hearty dinner, took a glass of eau sucree in which was put by mistake a teaspoonful of a saturated solution of cyanide of mercury. A short time after taking the poison, the patient experienced a general feeling of coldness, soon followed by nausea, vomiting, and diarrhoeic evacuations with violent colic. During the evacuations feeling of general prostration, soon amounting to a fainting fit, in which he fell to the floor, where he lay for an indefinite length of time in an unconscious state; he was alone in his room and received no aid. After consciousness had returned he crawled into bed, where he was found next m., 7 hours after taking the poison. Dr. Leon Simon saw him about 10 a. m. Not knowing the cause of the attack, he received an infusion of tea, which was soon after vomited up. At first sight the young man seemed to be suffering from an attack of cholerine; his face was pale, somewhat bluish, and distorted, the eyes sunken, skin icy cold, pulse small, 70 to 76. Tongue pale; violent thirst, but what he drank was immediately vomited; a disagreeable astringent taste in mouth. He had had no evacuation and had not urinated for 2 h. The abdomen was not tympanitic, or particularly sensitive to pressure. Simon thought that the repeated evacuations had carried the poison from the intestinal canal, and prescribed neither emetics nor chemical antidotes, but gave the patient hepar sulph., 3rd dil., with alternate drinks of milk and eliminated water. 6 p. m., patient had vomited twice, not very copiously, but had had much retching; 6 fluid offensive passages. The skin had become warm again; the pulse was quicker and stronger – 90 beats. The tongue continued pale, with a yellowish coating on back part. Scraping in oesophagus; difficult swallowing; pharynx looked red and arborescent. Violent thirst, burning in stomach; epigastrium and (slightly) abdomen painful to pressure. No urine apart from stools. N. was spent sleeplessly. Patient was much excited and talked without cessation. He got angry with his watchers, and talked at random in his rage. He drank much, vomited 6 times, and had 8 stinking green slimy stools; no urine passed. Next m. condition was same as evening before. Skin, hot, somewhat moist; headache; vertigo when sitting up; ringing in ears; tongue redder at edges, coated grey at back. Hepar sulph. continued. Next day condition was improved; he had vomited but once, and had 3 fluid passages much less painful; passed urine once; sleeplessness and excitability same; extremely violent headache. Vertigo and ringing in ears on sitting up. Great weakness. Belladonna 12. 15th. – Sleeplessness and headache same in n., but not so furibund; less thirst; no more vomiting; 6 slimy diarrhoeic stools, with some tenesmus. Pulse increased; skin moderately warm; less vertigo; mucous membrane of mouth affected, gums swollen, covered with a white layer, with a violet – coloured margin; tongue swollen, and covered with tenacious grey coating; entire mucous membrane of mouth and fauces red and arborescent. Nitric acid 6. 16th. – General condition same; fever in n., with sleeplessness and violent headache; no vomiting; no evacuation; condition of mouth somewhat worse. A white transparent layer, resembling mucous syphilitic patches, has formed on palatine arches and tonsils; further, there was present on inner surface of right cheek a round ulcer with grayish base and sharply defined edges, surrounded by a bright red border. Nitric acid 12. 17th and 18th. – Condition the same, except that the ulcer in the mouth had spread, and was covered with a layer of grayish exudation; great thirst, cannot take warm drinks or meat broth, the later seemed to him too salt. Constipation, and some pain in belly; the later is not distended, and not very sensitive to pressure; urine clear but scanty. On 17th patient was left without med. On 18th and 19th he received sulphur 24. He had continuous hiccough for 24 hours; this was at last relieved by nux vomica. 20th. – Condition of mouth improved. Ulcerated surface clean, and is beginning to cicatrise; gums less swollen, less red, and the white coating has disappeared from these and from throat. Less thirst; meat – broth and light soups well received. Constipation; urine more copious; nights are more quite; still patient has not his natural sleep. The neuralgic headache still continues during first part of n. Pulse small and weak, 70 to 75. Patient could sit up yesterday for an hours without being too much fatigued thereby. On 21st improvement continued, but on 22nd there was a sudden return of watery evacuations, which were preceded by violent colic; no urination; tongue is again covered with a grey coating; patient has a very disagreeable metallic taste, a return of the thirst, aversion to food, nausea; pulse accelerated but weak; skin moist and cold, and general prostration, . Arsenicum 12. 23rd. – Symptoms in mouth better; increased diarrhoea; since yesterday, 12 blackish, fluid, very foetid stools, and violent colic; urine scanty and dark. Extreme weakness, pale face, icy – cold skin; small thread – like pulse, 100; thirst moderate; aversion to food. China 6. 24th. – Diarrhoea the same; patient very weak; pulse small; skin moist and icy cold. Hippocratic face; could not sleep at n. on account of frequent evacuations. Carbo veg.24 25th. – But 8 evacuations during past 24 h. They were more yellow; one of them contained some blood. Pulse stronger, 100; skin not so cold, and countenance more natural; less thirst; tongue retains its grey coating. gums less inflamed and swollen, hut teeth painful. Mucous membrane of mouth and pharynx quite clean. Carbo veg.30 26th and 27th. – Considerable improvement. Diarrhoea checked and strength returning. Patient can remain up almost an hours; some return of appetite; patient can take soup; when sitting he complains of pain in rectum and about anus. 29th. – No more diarrhoea, but pains in rectum are becoming unbearable. The parts about anus are swollen, sensitive, and somewhat red; no stool but some black blood is expelled when making the effort. Belladonna 12. 30th. – All symptoms worse; 6 profuse evacuations of blood; patient is again extremely weak; pains in anus continue very severe; around anus small hemorrhoidal tumour, and wart – like elevation on mucous membrane. Rhus tox 18. March 31st, April 1st and 2nd. – The bloody passages, have ceased, but not the pains; besides the above – mentioned symptoms, there is found about the anus a grayish diphtheritic coating, quite similar to that on the inner cheeks; also erosions on mucous membrane; in short, condition of anus was similar to the pathological affection styled ulcerating mucous patches. Mercurius solub.18 3rd. – Aggravation of pain in rectum; extension of ulcers and of diphtheritic coating; ichorous discharge from rectum diffusing the characteristic gangrenous smell, and leaving broad blackish stains on sheets. Lachesis 24. 4th. – Rather less pain, and much less gangrenous odour; discharge from anus still profuse, but more pus – like. Since yesterday m. some pain in calf of left leg; on examination it was found that the veins formed two hard cords, which united a little below the bend of the knee; the slightest touch is very painful. Lachesis 12. 5th, 6th, and 7th. – Improvement daily; discharge from anus growing less and less; it is of a serous nature, and has scarcely any odour. Yesterday patient had a painful passage, but sensitiveness has much decreased. He can now sit on an air – cushion. The leg is much in the same condition, and begins to swell as soon as he is on his feet. 10th. – Discharge is nearly stopped; parts around anus are somewhat red, but there is no swelling or any diphtheritic coating; patient remains up for several hours each day; for 2 day past he has been able to eat and digest meat. Daily, one or two soft stools, but slightly painful. The leg is less painful continues somewhat swollen. No med. 12th. – Condition same as 2 day ago. Lachesis 30. 14th. – Leg is less painful, venous cords having grown much smaller; rectum and anus almost well. Lachesis 30. 18th. – Improvement continues. 28th. – Leg continues somewhat painful; otherwise well. Lachesis 200. 8 day after patient visited Simon. His condition was improved in every way. He could walk more than an hours without fatigue. May 14th. – Simon saw the patient for the last time; he had resumed his usual occupations. (Bull. de la Soc. Medorrhinum Hom. de France, iv, 340).

Experiments on animals

1a. A small bitch received 7 gr. dissolved in distilled water. For 5 m. retching, cramps, alternated with weakness; respiration and heart’s action at first accelerated, then abnormally slow. Death in 10 m. 1b. About 3 gr. were injected into connective tissue of thigh of a dog. In 3 m. retching and spasms, broken from time to time by fits of weakness lasting 3/4 h. The animal then remained weak with tottering gait; the vomiting stopped. In 4 hours all symptoms disappeared. 1c. About 3/5 gr. were injected into the jugular vein of a young dog; he immediately fell on his side; slight spasms, lasting but some seconds; very slow respiration, heart – beats only 32 per m. Respiration and circulation grew slower and slower, and the animal died without spasms in 5 m. 1d. The P. M. changes were of no decided character. Lungs contained little blood, and crepitated; heart was relaxed, and its chambers contained much blood, which was partly fluid. In the dog killed by injection into the jugular, the blood formed very elastic, firm, fibrous coagula in the vena cava ascendens and the iliac veins. In the other animals the blood in the vessels was mostly fluid. The colour of the mucous membrane of the stomach was very variable; in 2 cases there were dark red spots, formed by the union of many small vessels. The same colour, somewhat less marked, was found in a dog which received 12 gr. after fasting 36 h. The same appearance of mucous membrane of stomach and intestines was seen in the dog killed by hypodermic injection. The dog’s stomach was partly filled with food. Another dog, killed in the same way, had eaten nothing for 48 hours; the mucous membrane of stomach and intestines was whitish; he had vomited several times. In all the stomach was closely contracted, except in the one killed, in 10 m. by injection into the jugular vein. In all, without exception, the liver was filled with copious fluid blood. (ORFILA, op. cit.)

2. I poisoned a large dog with the cyanide, by injecting some of the crude drug under the skin. the symptoms were – nausea; vomiting; excessive thirst; many stools, of what I tool to be blood but proved to be bile and mucus, with much tenesmus; respiration very slow, the last hours before death about 1 per m.; dilatation of pupils; intermittent pulse, beating twice, then stopping once, then beating 5 times and stopping twice. The dog had no pain, but was in a listless state, with excessive and complete prostration. Post – mortem examination revealed inflammation of the larynx, with its mucous membrane and that of the posterior nares loaded with mucus; cardiac portion of stomach highly inflamed, the viscous containing about a pint of bile and mucus; whole intestinal tract filled with bile and rectum congested; liver highly congested; both ventricles of heart filled with dark blood, in right a white fibrinous clot. (BURT, Amer. Homoeopathist, ii, 29.).

About the author

Richard Hughes

Richard Hughes

Dr. Richard Hughes (1836-1902) was born in London, England. He received the title of M.R.C.S. (Eng.), in 1857 and L.R.C.P. (Edin.) in 1860. The title of M.D. was conferred upon him by the American College a few years later.

Hughes was a great writer and a scholar. He actively cooperated with Dr. T.F. Allen to compile his 'Encyclopedia' and rendered immeasurable aid to Dr. Dudgeon in translating Hahnemann's 'Materia Medica Pura' into English. In 1889 he was appointed an Editor of the 'British Homoeopathic Journal' and continued in that capacity until his demise. In 1876, Dr. Hughes was appointed as the Permanent Secretary of the Organization of the International Congress of Homoeopathy Physicians in Philadelphia. He also presided over the International Congress in London.

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