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 DUMORTIERITE, a mineral described in 1881 by M. F. Gonnard, who named it after Eugène Dumortier, a palaeontologist of Lyons, France. It is essentially a basic aluminium boro-silicate, belonging to the orthorhombic system; it occurs usually in fibrous forms, of smalt-blue, greenish-blue, lavender or almost black colour, and exhibits strong pleochroism. According to W. T. Schaller (Amer. Journ. Sci., 1905 (iv.), 19, p. 211) a purple colour may be due to the presence of titanium. Analyses of some specimens point to the formula (SiO4)3Al(AlO)7(BO)H, which, written in this form, explains the analogy with andalusite and the alteration into muscovite. Dumortierite occurs in gneiss at Chaponost, near Lyons, and at a few other European localities; it is found also in the United States, being known from near New York City, from Riverside and San Diego counties, California, and from Yuma county, Arizona. The last-named locality yields the mineral in some quantity in the form of dense fibres embedded in quartz, to which it imparts a blue colour. The mineral aggregate is polished as an ornamental stone, rather resembling lapis-lazuli.

 DUMOULIN, CHARLES [] (1500–1566), French jurist, was born in Paris in 1500. He began practice as an advocate before the parlement of Paris. Dumoulin turned Calvinist, and when the persecution of the Protestants began he went to Germany, where for a long time he taught law at Strassburg, Besançon and elsewhere. He returned to France in 1557. Dumoulin had, in 1552, written Commentaire sur l’édit du roi Henri II sur les petites dates, which was condemned by the Sorbonne, but his Conseil sur le fait du concile de Trente created a still greater stir, and aroused against him both the Catholics and the Calvinists. He was imprisoned by order of the parlement until 1564. It was as a jurist that Dumoulin gained his great reputation, being regarded by his contemporaries as the “prince of jurisconsults.” His remarkable erudition and breadth of view had a considerable effect on the subsequent development of French law. He was a bitter enemy of feudalism, which he attacked in his De feudis (Paris, 1539). Other important works were his commentaries on the customs of Paris (Paris, 1539, 1554; Frankfort, 1575; Lausanne, 1576), valuable as the only commentary on those in force in 1510, and the Extricatio labyrinthi dividui et individui, a treatise on the law of surety.

 DUMOURIEZ, CHARLES FRANÇOIS (1739–1823), French general, was born at Cambray in 1739. His father was a commissary of the royal army, and educated his son most carefully in various branches of learning. The boy continued his studies at the college of Louis-le-Grand, and in 1757 began his military career as a volunteer in the campaign of Rossbach. He received a commission for good conduct in action, and served in the later German campaigns of the Seven Years’ War with distinction; but at the peace he was retired as a captain, with a small pension and the cross of St Louis. Dumouriez then visited Italy and Corsica, Spain and Portugal, and his memorials to the duc de Choiseul on Corsican affairs led to his re-employment on the staff of the French expeditionary corps sent to the island, for which he gained the rank of lieutenant-colonel. After this he became a member of the Secret du roi, the secret service under Louis XV., where his fertility of diplomatic resource had full scope. In 1770 he was sent on a mission into Poland, where in addition to his political business he organized a Polish militia. The fall of Choiseul brought about his recall, and somewhat later he was imprisoned in the Bastille, where he spent six months, occupying himself with literary pursuits. He was then removed to Caen, where he was detained until the accession of Louis XVI.

Upon his release in 1774 he married his cousin Mlle de Broissy, but he was neglectful and unfaithful, and in 1789 the pair separated, the wife taking refuge in a convent. Meanwhile Dumouriez had devoted his attention to the internal state of his own country, and amongst the very numerous memorials which he sent in to the government was one on the defence of Normandy and its ports, which procured him in 1778 the post of commandant of Cherbourg, which he administered with much success for ten years. He became maréchal de camp in 1788; but his ambition was not satisfied, and at the outbreak of the Revolution, seeing the opportunity for carving out a career, he went to Paris, where he joined the Jacobin Club. The death of Mirabeau, to whose fortunes he had attached himself, was a great blow to him; but, promoted to the rank of lieutenant-general and commandant of Nantes, his opportunity came after the flight to Varennes, when he attracted attention by offering to march to the assistance of the Assembly. He now attached himself to the Girondist party, and on the 15th of March 1792 was appointed minister of foreign affairs. He was mainly responsible for the declaration of war against Austria (April 20), and the invasion of the Low Countries was planned by him. On the dismissal of Roland, Clavière and Servan (June 13), he took the latter’s post of minister of war, but resigned it two days later on account of the king’s refusal to come to terms with the Assembly, and went to join the army of Marshal Lückner. After the émeute of August 10 and Lafayette’s flight he was appointed to the command of the “Army of the Centre,” and at the same moment the Coalition assumed the offensive. Dumouriez acted promptly. His subordinate Kellermann repulsed the Prussians at Valmy (September 20, 1792), and he himself severely defeated the Austrians at Jemappes (November 6). Returning to Paris, he was received with a popular ovation; but he was out of sympathy with the extremists in power, his old-fashioned methodical method of conducting war exposed him to the criticism of the ardent Jacobins, and a defeat would mean the end of his career. Defeat coming to him at Neerwinden in January 1793, he ventured all on a desperate stroke. Arresting the commissaries of the Convention sent to inquire into his conduct, he handed them over to the enemy, and then attempted to persuade his troops to march on Paris and overthrow the revolutionary government. The attempt failed, and Dumouriez, with the duc de Chartres (afterwards King Louis Philippe) and his brother the duc de Montpensier, fled into the Austrian camp.

He now wandered from country to country, occupied in ceaseless intrigues with Louis XVIII., or for setting up an Orleanist monarchy, until in 1804 he settled in England, where the government conferred on him a pension of £1200 a year. He became a valuable adviser to the War Office in connexion with the struggle with Napoleon, though the extent to which this went was only known in public many years later. In 1814 and 1815 he endeavoured to procure from Louis XVIII. the bâton of a marshal of France, but was refused. He died at Turville Park, near Henley-on-Thames, on the 14th of March 1823. His memoirs were published at Hamburg in 1794. An enlarged edition, La Vie et les mémoires du Général Dumouriez, appeared at Paris in 1823. Dumouriez was also the author of a large number of political pamphlets.

 DUMP. (1) (Of obscure origin; corresponding in form and possibly connected with the word, are the Mid. Dutch domp, mist or haze, and the Ger. dumpf, dull or dazed), a state of wonder, perplexity or melancholy. The word thus occurs particularly in the plural, in such phrases as “doleful dumps.” It was also formerly used for a tune, especially one of a mournful kind, a dirge. (2) (Connected with “dumpy,” but appearing later than that word, and also of obscure origin), something short and thick, and hence used of many objects such as a lead counter or medal, of a coin formerly used in Australia, formed by punching a circular piece out of a Spanish dollar, and of a short thick bolt used in shipbuilding. (3) (Probably of Norse origin, cf. Nor. dumpa, and Dan. dumpe, meaning “to fall” suddenly, with a bump), to throw down in a heap, and hence