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 one point to another in broken, incoherent phrases. Grace of expression he had none; perhaps no man of equal spiritual insight ever found it so hard to make his meaning clear, whether on paper or by word of mouth. On the other hand, Jansenism, considered as a practical religious revival, is altogether his work. He dragged the Augustinian mysticism out of the Louvain classrooms, and made it a vital spiritual force in France. Without him there would have been no Pascal—no Provincial Letters, and no Pensées.

 DUVEYRIER, HENRI (1840–1892), French explorer of the Sahara, was born in Paris on the 28th of February 1840. His youth was spent partly in London, where he met Heinrich Barth, then preparing the narrative of his travels in the western Sudan. At the age of nineteen Duveyrier, who had already learnt Arabic, began a journey in the northern parts of the Sahara which lasted nearly three years. On returning to France he received, in 1863, the gold medal of the Paris Geographical Society, and in 1864 published Exploration du Sahara: les Touareg du nord. In the war of 1870 he was taken prisoner by the Germans. Subsequently he made several other journeys in the Sahara, adding considerably to the knowledge of the regions immediately south of the Atlas, from the eastern confines of Morocco to Tunisia. He also examined the Algerian and Tunisian shats and explored the interior of western Tripoli. Duveyrier devoted special attention to the customs and speech of the Tuareg, with whom he lived for months at a time, and to the organization of the Senussi. In 1881 he published La Tunisie, and in 1884 La Confrérie musselmane de Sidi Mohammed Ben Alî-Es-Senôusi et son domaine géographique. He died at Sevres on the 25th of April 1892.

 DUX (Czech Duchcov), a town of Bohemia, Austria, 86 m. N.N.W. of Prague by rail. Pop. (1900) 11,921, three-fourths German. It is situated in the centre of an extensive and well-worked lignite deposit and manufactures glass, porcelain and earthenware. In Dux is a castle belonging to Count Waldstein, a kinsman of Wallenstein, which contains a picture gallery with two portraits of Wallenstein by Van Dyck, and a museum with a collection of arms and armour and several relics of the great general.

 DUXBURY, a township of Plymouth county, Massachusetts, on Massachusetts Bay, 36 m. S.S.E. of Boston. Pop. (1890) 1908; (1905, state census) 2028. Area, 25·5 sq. m. Duxbury is served by the Old Colony system of the New York, New Haven & Hartford railway. In the township are the villages of Duxbury, South Duxbury, West Duxbury, North Duxbury, Island Creek and Millbrook. The soil is sandy, the surface of the country well wooded and broken by a number of ponds and creeks. Duxbury is a summer resort, with a large hotel at Standish Shore. Duxbury has a public library, and is the seat of the Powder Point school for boys, and Partridge Academy, founded in 1828 by a bequest of $10,000 from George Partridge of Duxbury, and incorporated in 1830. On Captain’s Hill is the Standish Monument (begun in 1872), a circular tower, on an octagonal base, of rough Hallowell granite, surmounted by a statue of Miles Standish, 124 ft. from the ground. The Standish house, built in 1666 by Miles’s son, Alexander, is still in existence. In South Duxbury is an old burying ground, in which the oldest marked grave is that of Jonathan Alden (d. 1697), son of John Alden. For many years there were important cod and mackerel fisheries here and Duxbury clams were famous; there were large shipyards in Duxbury in the 18th century and in the first half of the 19th. At present cranberries are the only product of importance. The first settlement was made here in 1631 by Miles Standish (to whom Captain’s Hill was granted), William Brewster, John Alden, and a few others. In 1632 a church was organized and the present name was adopted from Duxbury Hall, Lancashire, the old seat of the Standish family; the Indian name had been Mattakeeset. The township was incorporated in 1637; it originally included Bridgewater and parts of Pembroke and Kingston.

 DVINA, the name of two rivers of European Russia.

1. The, or Dvina Syevernaya, belongs to the basin of the White Sea, and is formed by the junction of the Sukhona and the Yug, which, rising, the former in the south-west and the latter in the south-east of the government of Vologda, meet in the neighbourhood of Velikiy-Ustyug, at a height of 300 ft. above the sea, in 61° 20′ N. and 46° 20′ E. The conjoint stream then flows N.W. to the Gulf of Archangel, which it reaches 50 m. below the city of Archangel. From its mouth to the confluence of the co-tributary streams the distance is about 470 m., and to the source of the Sukhona 780 m. The drainage area is estimated at 141,000 sq. m. Except at the rapids the current of the Dvina is comparatively slow, as the average fall per mile is only 9 in. Till its union with the Vychegda, a river which exceeds it in volume, it flows for the most part in a single, well-defined and permanent channel; but below that point it often splits into several branches, and not infrequently alters its course. In the neighbourhood of Archangel it divides into three distinct arms, which form a regular delta; but of these that of Berezov alone is navigable for sea-going vessels, and even it is impeded by a bar at the mouth, with not more than 14 or 15 ft. of water at full tide. Just above the point where the delta begins the river is joined by a large tributary, the Pinega, from the right. Above the confluence of the Vychegda the breadth is about 1750 ft.; below that point it widens out to 3500 ft.; and near Archangel it attains more than three times that measure. The channel is free from ice for about 174 days in the year. By means of the Duke Alexander of Württemberg Canal, the river is connected with the Neva and the Volga.

2. The, or Dvina Zapadnaya, in German Düna and in Lettish Daugava, belongs to the Baltic basin, and takes its rise in a small lake about 800 ft. above the level of the sea, in the government of Tver, not far from the sources of the Volga and the Dnieper. After dividing Tver in part from Pskov in part, it skirts the east and south of the government of Vitebsk, separates part of the latter from Vilna, and then divides Vitebsk and Livonia from Courland, and disembogues in the southern end of the Gulf of Riga. Its length is 640 m. and it drains an area of 32,960 sq. m. From Dvinsk (Dünaburg) to Riga, a distance of 135 m., there is altogether a fall of 295 ft., of which 105 ft. are in the 40 m. from Jakobstadt to Friedrichstadt. In the lower part of its course the river attains an ordinary depth of 30 ft. and an average breadth of 1400 ft.; but during the spring flood it sometimes rises 14 ft. above its usual level, and its waters spread out to a mile in width. Near the mouth the river is usually free from ice for 245 days in the year, and in the government of Vitebsk for 229. It is navigable from the confluence of the Mezha (i.e. from Vitebsk) downwards, but the number of rapids and shallows greatly diminishes its value. Navigation can also be carried on by the following tributaries: the Usvyat, Mezha, Kasplya, Ulla, Disna and Bolder-aa. This river was formerly called the Khezin or Turunt, and at the present day it has the name of Polot among the White Russians. Salmon and lampreys abound in its waters.

 DVINSK, the official name since 1893 of, a town and fortress of western Russia, in the government of Vitebsk, 162 m. by rail N.W. of the city of Vitebsk, on the right bank of the Dvina (Düna), in 55° 53′ N. and 26° 23′ E., and at the intersection of two main railway lines—Riga-Smolensk and Vilna-St Petersburg. It is the chief strategic position for the defence of the Dvina. It consists of four portions—the main town, or fortress, the old suburb, the new suburb, and on the left bank of the river the village of Griva. Among the industrial establishments are tanneries and breweries, saw-mills, flour-mills, brick and tile works and limekilns. The town is an important commercial centre, especially for flax, hemp, tallow and timber. The population increased from 25,764 in 1860 to 72,231 in 1900,