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LEFT DIMENSION 366 DINORNIS from political life on account of ill- health; but in the latter year he re- appeared, and was elected for East Mayo. He was one of the most prominent pro- moters of the "Plan of Campaign." In 1896 he succeeded Justin McCarthy as chairman of the main section of the Na- tionalist party. In 1901 he accepted the leadership of John Redmond in the recon- stituted nationalist party, and worked actively as his lieutenant. DIMENSION, in algebra, a literal factor of a product or term; also called a degree; thus a'b is an expression of three dimensions. A simple equation is said to be of one dimension. A quadratic of two, a cubic of three, and so on. In geometry, extension in a single line or direction. A line is extended in one direction, or has one dimension, that is length; a surface is extended in two directions, or has two dimensions, length and breadth; a solid is extended in three directions, or has three dimensions, length, breadth, and height or thickness. DIMORPHISM, the power of assum- ing or crystallizing in two distinct forms. Sulphur, for instance, which usually crys- tallizes in the rhombic system^ when melted, may form monoclinohedric crys- tals. The same chemical substance may form two or even more distinct bodies or mineral species. Thus carbon in one form is the diamond, in another graphite; and carbonate of lime appears as calc- spar or as arragonite. DINAN, a town in the department of C6tes-du-Nord, France, situated on the Ranee, 15 miles S. of Saint-Malo. It has an old castle, the cathedral of St. Sauveur, and a valuable museum. The manufactures include agricultural imple- ments, linen, wooden goods, barges, cider and sugar. The town has relics going back to the Romans. Pop. about 12,000. DINANT, a town of Belgium, in the province of Namur. It is on the Meuse river. Prior to the World War it had many noteworthy buildings, including the church of Notre-Dame, and the city hall, which was once the palace of the princes of Liege. There were important manufactures, including paper mills, carpet factories, breweries, tanneries, etc. The city was notable for its pro- duction of metal ware and glass work. Dinant suffered severely during the Ger- man invasion of Belgium in 1914. Pop. about 8,000. DINARIC ALPS, the name applied to the mountains connecting the Julian Alps with the Balkan system. The main range stretches from N. W. to S. E., separating Dalmatia from Bosnia and Herzegovina, as far as the mouth of the Narenta; and a minor chain extends through the Dal- matian coast country. The mountains are principally calcareous; the highest summits are Orjen (6,225) and Dinara (5,940), and the mean height is 2,300 feet. D'INDY (PAUL MARIE THEO- DORE), VINCENT, a French composer, He was born at Paris, 1851, and was edu- cated in Paris schools, becoming a pupil of Cesar Franck for musical composition, and chief of the choirs of the Concerts Colonne, 1874. He received the Grand Post for musical composition in 1885 and was the founder, with Charles Bordes, of tLs Schola Cantorum, of which he continued director after Bordes' death. He was professor at the Conservatoire and a member of the Commission de I'En- seignment musical of Paris. His publica- tions include: "Franck," "Beethoven"; musical) "La Legende de Saint Chris- tophe," a sacred drama, "Le Chant de la Cloche"; 3 symphonies; and other works. DINGLEY, NELSON, an American legislator; born in Durham, Me., Feb. 15, 1832. He graduated from Dart- mouth College in 1855; was elected to the State Legislature six times; was gov- ernor of Maine in 1874-1875 ; was elected to Congress in 1881, and was re-elected for seven terms. He was the author of the Dingley Tariff Bill of 1897, and a member of the Anglo-American Com- mission of 1898. He died in Washington, D. C, Jan. 13, 1899. DINKA, a powerful tribe of Negritos who lived on both sides of the White Nile between lat. 6° and 12° N. Their territory covers 60,000 square miles. They are intelligent, have some skill in making articles for household use, and also follow agriculture. Each village is governed by its own chief. DINOCERATA, an order of mammalia having on each of the four feet five well- developed toes, each terminated by a hoof. Three horn cores. No upper in- cisors; upper canines assuming the form of long tusks directed downward. The species are large mammals from the Eocene of North America. Professor Cope ranks the Dinocerata as an aberrant group of Ungidata, while Professor Marsh considers them a distinct order in- termediate between the PerissofLactyle Ungnlata and the Proboscidea. DINORNIS. or DEINORNIS, a genus of fossil birds, founded by Professor Owen, and published by him in 1839. Subsequent discoveries have brought to light several species of Dinornis, and some allied genera. D. giganteus was from 10 to 11 or 12 feet high; D. stuthioides was 7 feet, or €h§ height of