[Democritus], a Greek philosopher, born in Abdera, Thrace, of wealthy parents; spent his patrimony in travel, gathered knowledge from far and near, and gave the fruits of it in a series of writings to his contemporary compatriots, only fragments of which remain, though they must have come down comparatively entire to Cicero's time, who compares them for splendour and music of eloquence to Plato's; his philosophy was called the Atomic, as he traced the universe to its ultimate roots in combinations of atoms, in quality the same but in quantity different, and referred all life and sensation to movements in them, while he regarded quiescence as the summum bonum; he has been called the Laughing Philosopher from, it is alleged, his habit of laughing at the follies of mankind; b. 460 B.C.
[Democritus Junior], a pseudonym under which Burton published his "Anatomy of Melancholy."
[Demogeot], French littérateur, born at Paris; wrote a history of literature, chiefly French (1808-1894).
[Demogorgon], a terrible deity, the tyrant of the elves and fairies, who must all appear before him once every five years to give an account of their doings.
[Demoivre, Abraham], a mathematician, born in Champagne; lived most of his life in England to escape, as a Protestant, from persecution in France; became a friend of Newton, and a Fellow of the Royal Society, and was of such eminence as a mathematician that he was asked to arbitrate between the claims of Newton and Leibnitz to the invention of fluxions (1667-1754).
[Demon], or Daimon, a name which Socrates gave to an inner divine instinct which corresponds to one's destiny, and guides him in the way he should go to fulfil it, and is more or less potent in a man according to his purity of soul.
[De Morgan, Augustus], an eminent mathematician, born in Madura, S. India; was professor of Mathematics in London University from 1828 till his death, though he resigned the appointment for a time in consequence of the rejection of a candidate, James Martineau, for the chair of logic, on account of his religious opinions; wrote treatises on almost every department of mathematics, on arithmetic, algebra, trigonometry, differential and integral calculus, the last pronounced to be "the most complete treatise on the subject ever produced in England"; wrote also "Formal Logic" (1806-1871).
[Demosthenes], the great Athenian orator, born in Athens; had many impediments to overcome to succeed in the profession, but by ingenious methods and indomitable perseverance he subdued them all, and became the first orator not of Greece only, but of all antiquity; a stammer in his speech he overcame by practising with pebbles in his mouth, and a natural diffidence by declaiming on the sea-beach amid the noise of the waves; while he acquired a perfect mastery of the Greek language by binding himself down to copy five times over in succession Thucydides' "History of the Peloponnesian War"; he employed 15 years of his life in denunciation of Philip of Macedon, who was bent on subjugating his country; pronounced against him his immortal "Philippics" and "Olynthiacs"; took part in the battle of Cheronea, and continued the struggle even after Philip's death; on the death of Alexander he gave his services as an orator to the confederated Greeks, and in the end made away with himself by poison so as not to fall into the hands of Autipater (385-322 B.C.). See [Ctesiphon].
[Dempster, Thomas], a learned Scotchman, born in Aberdeenshire; held several professorships on the Continent; was the author of "Historia Ecclesiastica Gentis Scotorum," a work of great learning, but of questionable veracity; has been reprinted by the Bannatyne Club; his last days were embittered by the infidelity of his wife (1579-1625).
[Denarius], a silver coin among the Romans, first coined in 269 B.C., and worth 8½ d.