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 decomposes the bile-pigment is arrested by the antiseptic power of the drug, so that the excreta are of a very dark colour. The classical experiments of William Rutherford (1839–1899), of Edinburgh, showed that calomel does not increase the amount of bile formed by the liver. Corrosive sublimate does, however, stimulate the liver to a slight degree. The value of calomel in hepatic torpor is as an excretory, not a secretory, cholagogue, the gall-bladder being stimulated to expel its stagnant contents. In large doses mercurials somewhat diminish the secretion of bile. The greater part of the mercury administered by the mouth, in whatever form, is excreted as mercuric sulphide. Prior to this decomposition the mercury exists as a complex soluble compound with sodium, chlorine and albumen. When perchloride of mercury is injected subcutaneously the sodium chloride in the blood similarly prevents the precipitation of the albuminate of mercury, and it is therefore desirable to add a little sodium chloride to the solution for injection of mercuric chloride.

Some observers assert that mercury is a haematinic, increasing, like iron, the amount of haemoglobin in the blood. Whilst this is doubtful it is certain that large doses, when continued, produce marked anaemia. The excretion of the drug is accomplished by all the secreting glands, including the breasts, if these are functioning. All the secretions of the body, except that of the peptic glands of the stomach, are stimulated, but the excretion of mercury is slow, and it is typically one of the drugs that are cumulative, like arsenic and digitalis.

Mercury is largely used in affections of the alimentary canal, and has an obscure but unquestionable value in many cases of heart-disease and arterial degeneration. But its value in syphilis (see ) far outweighs all its other uses.

Toxicology.—Acute poisoning by mercurials usually occurs in the case of corrosive sublimate. There is intense gastro-intestinal inflammation, with vomiting, frequent “rice-water” stools and extreme collapse. The treatment, except when the case is seen at once, is very difficult, but white-of-egg or other form of albumen is the antidote, forming an insoluble compound with the perchloride.

Chronic poisoning (hydrargyrism or mercurialism) is of great importance, since any indication of its symptoms must be closely watched for in patients who are under mercurial treatment. Usually the first symptom is slight tenderness of the teeth whilst eating, and some foetor of the breath. These symptoms become more marked and the gums become the seat of severe inflammation, being spongy, vascular and prone to bleed. The salivary glands are swollen and tender, and the saliva pours from the mouth, and may amount to pints in the course of a day. The teeth become quite loose and may fall out. The symptoms are aggravated until the tongue and mouth ulcerate, the jaw-bone necroses, haemorrhages occur in various parts of the body, and the patient dies of anaemia, septic inflammation or exhaustion. The treatment consists, besides stopping the intake of poison and relieving the symptoms, in the administration of potassium iodide in small, often repeated doses.

.—For the history of mercury see B. Neumann, Die Metalle (1904); A. Rossing, Geschichte der Metalle (1901). The general chemistry is treated in detail in O. Dammer, Handbuch der anorganischen Chemie, and H. Moissan, Traité de chimie minérale. For the metallurgy reference may be made to Carl Schnabel, Handbook of Metallurgy, vol. ii. (1906), translated by H. Louis.

MERCY (or ), FRANZ,, lord of Mandre and Collenburg (d. 1645), German general in the Thirty Years’ War, who came of a noble family of Lorraine, was born at Longwy between 1590 and 1598. From 1606 to 1630 he was engaged in the imperial service, By the latter year he had attained high military rank, and after distinguishing himself at the first battle of Breitenfeld (1631) he commanded a regiment of foot on the Rhine and defended Rheinfelden against the Swedes with the utmost bravery, surrendering only after enduring a five-months’ siege. He now became a general officer of cavalry (General-Feldwachtmeister), and in 1635, 1636 and 1637 took part in further campaigns on the Rhine and Doubs. In September 1638 he was made master-general of ordnance in the army of Bavaria, then the second largest army in Germany. In the next campaign he was practically commander-in-chief of the Bavarians, and at times also of an allied army of Imperialists and Bavarians. He was now considered one of the foremost soldiers in Europe, and was made general field marshal in 1643, when he won his great victory over the French marshal Rantzau at Tuttlingen (Nov. 24–25), capturing the marshal and seven thousand men. In the following year Mercy opposed the French armies, now under the duke of Enghien (afterwards the great Condé) and the vicomte de Turenne. He fought, and in the end lost, the desperate bat le of Freiburg, but revenged himself next year by inflicting upon Turenne the defeat of Mergentheim (Marienthal). Later in 1645, lighting once more against Enghien and Turenne, Mercy was killed at the battle of Nördlingen (or Allerheim) at the crisis of the engagement, which, even without Mercy’s guiding hand, was almost a drawn battle. He died on the 3rd of August 1645. On the spot where he fell, Enghien erected a memorial, with the inscription Sta viator, heroem calcas.

His grandnephew (1666–1734), Imperial field marshal, son of his brother Kaspar, who fell at Freiburg, was born in Lorraine, and entered the Austrian army as a volunteer in 1682. He won his commission at the great battle of Vienna in the following year; and during seven years of campaigning in Hungary rose to the rank of Rittmeister. A wound sustained at this time permanently injured his sight. For five years more, up to 1697, he was employed in the Italian campaigns, then he was called back to Hungary by Prince Eugene and won on the field of Zenta two grades of promotion. He displayed great daring in the first campaigns of the Spanish Succession War in Italy, twice fell into the hands of the enemy in fights at close quarters and for his conduct at the surprise of Cremona (Jan. 31, 1702) received the emperor’s thanks and the proprietary colonelcy of a newly raised cuirassier regiment. With this he took part in the Rhine campaign of 1703, and the battle of Friedlingen, and his success as an intrepid leader of raids and forays became well known to friend and foe. He was on that account selected early in 1704 to harry the elector of Bavaria’s dominions. He was soon afterwards promoted General-Feldwachtmeister, in which rank he was engaged in the battle of the Schellenberg (July 2, 1704). In the rest of the war he was often distinguished by his fiery courage. He rose to be general of cavalry in the course of these ten years. His resolute leadership was conspicuous at the battle of Peterwardein (1716) and he was soon afterwards made commander of the Banat of Temesvar. At the great battle of Belgrade (1717) he led the second line of left wing cavalry in a brilliant and decisive charge which drove the Turks to their trenches. After the peace he resumed the administration of the Banat, which after more than 150 years of Turkish rule needed a humane and capable governor. But before his work was done he was once more called away to a command in the field, this time in southern Italy, where he fought the battle of Francavilla (June 20, 1719), took Messina and besieged Palermo. For eleven years more he administered the Banat, reorganizing the country as a prosperous and civilized community. In 1734 he was made a general field marshal in the army, but on the 29th of June was killed at the battle of Parma while personally leading his troops. He left no children, and his name passed to Count Argenteau, from whom came the family of Mercy-Argenteau (see ).

MERCY (adapted from Fr. merci, Lat. merces, reward), compassion, pardon, pity or forgiveness. The Latin Word was used in the early Christian ages for the reward that is given in heaven to those who have shown kindness without hope of return. The French word, except in such phrases as Dieu merci sans merci, is principally used in the sense of “thanks,” and is seen in the old English expression “gramercy,” i.e. grant merci, great, many thanks, which Johnson took for “grant me mercy.” In the medieval Church there were seven “corporal” and seven “spiritual works of mercy” (opera misericordiae); these were (a) the giving of food to the hungry and drink to the thirsty, the clothing of the naked, the visitation of the sick and of prisoners, the receiving of strangers, and the burial of the dead; (b) the conversion of sinners, teaching of the ignorant, giving of counsel to the doubtful, forgiveness of injuries, patience under wrong, prayer for the living and for the dead. The order of the Sisters of Mercy is a religious sisterhood of the Roman Church. It is found chiefly in England and Ireland, but there are branches in the United States of America, in South America and in Australia and New Zealand. It was founded in 1827 in Dublin by Miss Catherine McAuley (1787–1841). The object was to perform the corporal and spiritual works of mercy.

MERCY-ARGENTEAU, FLORIMOND CLAUDE, (1727–1794), Austrian diplomatist, son of Antoine, comte de Mercy-Argenteau, entered the diplomatic service of Austria, going to Paris in the train of Prince Kaunitz. He became