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 of the river is about 5 in. to the mile. In its upper course, which may be regarded as extending to the confluence of the Voronezh in 51° 40′, the Don flows for the most part through a low-lying, fertile country, though in the government of Ryazan its banks are rocky and steep, and in some places even precipitous. In the middle division, or from the mouth of the Voronezh to the point where it makes its nearest approach to the Volga, the stream cuts its way for the most part through Cretaceous rocks, which in many places rise on either side in steep and elevated banks, and at intervals encroach on the river-bed. A short distance below the town of Rostov it breaks up into several channels, of which the largest and most southern retains the name of the river. Before it receives the Voronezh the Don has a breadth of 500 to 700, or even in a few places 1000 ft., while its depth varies from 4 to 20 ft.; by the time it reaches its most eastern point the depth has increased to 8-50 ft., and the ordinary breadth to 700-1000 ft., with an occasional maximum of 1400 ft.; in the lowest division the depth is frequently 70 ft., and the breadth in many places 1870 ft. Generally speaking, the right bank is high and the left flat and low. Shallow reaches are not uncommon, and there are at least seven considerable shoals in the south-western part of the course; partly owing to this cause, and partly to the scarcity of ship-timber in the Voronezh government, the Don, although navigable as far up as Voronezh, does not attain any great importance as a means of communication till it reaches Kachalinskaya in the vicinity of the Volga. From that point, or rather from Kalach, where the railway (built in 1862) from the Volga has its western terminus, the traffic is very extensive. Of the tributaries of the river, the Voronezh, the Khoper, the Medvyeditsa and the Donets are navigable—the Donets having a course of 680 m., and during high water affording access to the government of Kharkov. The Manych, another large affluent on the left, marks the ancient line of water connexion between the Sea of Azov and the Caspian Sea. The lower section of the Don is subject to two annual floods, of which the earlier, known as the “cold water,” is caused by the melting of the snow in the country of the Don Cossacks, and the later, or the “warm water,” is due to the same process taking place in the region drained by the upper parts of the stream. About the beginning of June the river begins to subside with great rapidity; in August the water is very low and navigation almost ceases; but occasionally after the September rains the traffic with small craft is again practicable. Since the middle of the 18th century there have been five floods of extraordinary magnitude,—namely, in 1748, 1786, 1805, 1820 and 1845. The river is usually closed by ice from November or December to March or April, and at rare intervals it freezes in October. At Aksai, in the delta, it remains open on the average for 250 days in the year, at the mouth of the Medvyeditsa for 239, and at Novo-Cherkask, on another arm of the delta, for 246. This river supports a considerable fishing population, who despatch salt fish and caviare all over Russia. Salmon and herrings are taken in large numbers.

 DON, a river in the south of Aberdeenshire, Scotland, rising in peat-moss to the east of Glen Avon on the borders of Banffshire, at a height of nearly 2000 ft. above the sea. It follows a generally easterly course, roughly parallel with that of the Dee, and a few miles to the south of it, falling into the North Sea close to Old Aberdeen, after a run of 82 m. At the mouth the two rivers are only 2 m. apart. Like its greater neighbour, the Don is an excellent salmon stream. On the left its chief affluents are the Ernan, Nochty, Bucket and Urie; on the right, the Conrie, Carvie, Deskry and Strow. The principal places of interest on its banks are Strathdon, Towie, Kildrummy, Alford, Keig, Monymusk, Inverurie, Kintore and Dyce.

 DONAGHADEE, a market town of Co. Down, Ireland, in the north parliamentary division, near the south of Belfast Lough, on the Irish Channel, 25 m. E. by N. of Belfast by a branch of the Belfast and Co. Down railway. Pop. (1901) 2073. It is the nearest port in Ireland to Great Britain, being 21½ m. S.W. of Portpatrick in Wigtownshire. Telegraph and telephone cables join these ports, but a regular passenger route does not exist owing to the unsuitability of Portpatrick. Donaghadee harbour admits vessels up to 200 tons. On the north-east side of the town there is a rath or encampment 70 ft. high, in which a powder magazine is erected. The parish church dates from 1626. There are two holy wells in the town. The town is frequented as a seaside watering-place in the summer months.

 DONALDSON, SIR JAMES (1831– &emsp;&emsp; ), Scottish classical scholar, educational and theological writer, was born at Aberdeen on the 26th of April 1831. He was educated at Aberdeen University and New College, London. In 1854 he was appointed rector of the Stirling high school, in 1866 rector of that of Edinburgh, in 1881 professor of humanity in the university of Aberdeen, and in 1890 principal of the university of St Andrews, by the Universities (Scotland) Act. His chief works are: Modern Greek Grammar (1853); Lyra Graeca (1854), specimens of Greek lyric poetry from Callinus to Soutsos; A Critical History of Christian Literature and Doctrine from the Death of the Apostles to the Nicene Council (i.-iii., 1864–1866; new ed. of i. as The Apostolical Fathers, 1874), a book unique of its kind in England at the time of its appearance and one which adds materially to the knowledge of Christian antiquities as deduced from the apostolic fathers; Lectures on the History of Education in Prussia and England (1874); The Westminster Confession of Faith and the Thirty-Nine Articles of the Church of England (1905); Woman, her position and influence in ancient Greece and Rome (1907). He was knighted in 1907.

 DONALDSON, JOHN WILLIAM (1811–1861), English philologist and biblical critic, was born in London on the 7th of June 1811. He was educated at University College, London, and Trinity College, Cambridge, of which society he subsequently became fellow. In 1841 he was elected headmaster of King Edward’s school, Bury St Edmunds. In 1855 he resigned his post and returned to Cambridge, where his time was divided between literary work and private tuition. He died on the 10th of February 1861. He is remembered as a pioneer of philology in England, and as a great scholar in his day, though much of his work is now obsolete. The New Cratylus (1839), the book on which his fame mainly rests, was an attempt to apply to the Greek language the principles of comparative philology. It was founded mainly on the comparative grammar of Bopp, but a large part of it was original, Bopp’s grammar not being completed till ten years after the first edition of the Cratylus. In the Varronianus (1844) the same method was applied to Latin, Umbrian and Oscan. His Jashar (1854), written in Latin as an appeal to the learned world, and especially to German theologians, was an attempt to reconstitute the lost biblical book of Jashar from the remains of old songs and historical records, which, according to the author, are incorporated in the existing text of the Old Testament. His bold views on the nature of inspiration, and his free handling of the sacred text, aroused the anger of the theologians. Of his numerous other works the most important are The Theatre of the Greeks; The History of the Literature of Ancient Greece (a translation and completion of C. O. Müller’s unfinished work); editions of the Odes of Pindar and the Antigone of Sophocles; a Hebrew, a Greek and a Latin Grammar.

 DONATELLO (diminutive of Donato) (c. 1386–1466), Italian sculptor, was the son of Niccolò di Betto Bardi, a member of the Florentine Woolcombers’ Gild, and was born in Florence probably in 1386. The date is conjectural, since the scanty contemporary records of Donatello’s life are contradictory, the earliest documentary reference to the master bearing the date 1406, when a payment is made to him as an independent sculptor. That Donatello was educated in the house of the Martelli family, as stated by Vasari, and that he owed to them his introduction to his future friend and patron, Cosimo de’ Medici, is very doubtful, in view of the fact that his father had espoused the cause of the Albizzi against the Medici, and was in consequence banished from Florence, where his property was confiscated. It is, however, certain that Donatello received his first training, according to the custom of the period, in a goldsmith’s workshop, and that he worked for a short time in Ghiberti’s studio. He was too young to enter the competition for the baptistery gates in 1402, from which Ghiberti issued victorious against Brunelleschi, Jacopo