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Dark Ages – Dawes' Holes

Dark Ages

THE, a period supposed to extend from the fall of the Roman empire, A. D. 475, to the revival of literature on the discovery of the Pandects at Amalfi in 1137. Not to draw the limits too finely, say 700 years (450 to 1150).

The Middle Ages may be extended to about 1550, covering from 10 to 11 centuries.

Dartford

a thriving market-town of Kent, England; in the narrow valley of the Darent, 2 miles above its influx to the Thames, and 17 E. S. E. of London.

Edward III. here founded an Augustinian nunnery (1355); St. Edmund's chantry was a great place of pilgrimage; and at Dartford Wat Tyler began his rebellion (1381). Pop., about 40,000.

Dartmouth

a town of Massachusetts, in Bristol co. It is on the Paskamansett river. Its chief industries are poultry raising and dairying. There are also manufactures of box boards.

There are three public libraries and other public buildings. The surrounding country is a well-known summer resort. Pop. (1910) 4,378; (1920) 6,493.

Dartmouth College

an educational (non-sect.) institution in Hanover, N. H.; founded in 1769; reported at the end of 1919: Professors and instructors, 121; students, 1,673; volumes in the library, 150,000; productive funds, $4,500,- 000; income, $450,000; president, Ernest Mark Hopkins, Litt.D., LL.D.

Dasyprocta

a genus of mammals, the typical one of the family Dasyproctidæ, or in some classifications a genus of Cavidæ. It contains the agoutis.

Dasyure

the brush-tailed opossums, a genus of marsupial animals, sub-order Sarcophaga. They are natives of Australia. The name is derived from the tails being hairy, in which they differ from the opossums of America.

Datholite

a monoclinic mineral, of colors, varying from white to olivegreen. It is of a vitreous luster, and translucent. Specific gravity, 2.8-3; hardness, 5-5.5. It is found in various localities in North America, Scotland, Sweden, etc. Composition: Silica, 36.08- DATISCACEÆ 38.51; boric acid, 19.34-22.40; lime, 34.68-35-67; water, 4.60-8.63.

David

the capital of Chiriqui, in Panama, in a fertile plain on the Rio David, which enters the Pacific 8 miles to the S. Stock-raising and the cultivation of tobacco are extensively engaged in, and there is a considerable trade.

Pop. 9,000.

Davidson College

an educational in 1837, under the auspices of the Presbyterian Church; reported at the end of 1919: Professors and instructors, 16; students, 379; president, Wm. J. Martin,

Da Vinci

See LEONARDO DA VINCI. an

Davy Lamp

the safety-lamp of Sir Humphry Davy, in which a wire-gauze envelope covers the flame-chamber and prevents the passage of flame outward to the explosive atmosphere of the mine, while it allows circulation of air.

Dawes' Holes

minute circular spots on the nucleus of a sun-spot, darker than the rest of the nucleus, and supposed to be the months of tubular of of tubular tubu orifices penetrating to unknown depths.

They were first observed by the astronomer whose name they bear.