=Democ´ritus.= A celebrated philosopher of Abdera, one of the disciples of Leucippus. He travelled over the greatest part of Europe, Asia, and Africa, in quest of knowledge, and returned home in the greatest poverty. He indulged in continual laughter at the follies of mankind for distracting themselves with care and anxiety in the short term of their lives. He told Darius, who was inconsolable for the loss of his wife, that he would raise her from the dead if he could find three persons who had gone through life without adversity, whose names he might engrave on the queen's monument. He taught his disciples that the soul died with the body. He died in his 109th year, B.C. 361. He has been termed "the laughing philosopher." =Demos´thenes.= A celebrated Athenian, was son of a rich blacksmith and Cleobule. He became pupil of Plato, and applied himself to study the orations of Isocrates. At the age of seventeen he gave early proof of his eloquence and abilities in displaying them against his guardians, from whom he obtained restitution of the greater part of his estate. To correct the stammering of voice under which he labored he spoke with pebbles in his mouth. In the battle of Cheronæa he evinced cowardice, and saved his life by flight. He ended his life by taking poison, which he always carried in a quill, in the sixtieth year of his age, B.C. 322. =Deuca´lion.= A son of Prometheus, who married Pyrrha, the daughter of Epimetheus. He reigned over part of Thessaly, and in his age the earth was covered by a deluge of water, sent by Jupiter as a punishment for the impiety of mankind. Deucalion constructed a ship, and by this means saved himself and Pyrrha. The ship, after being tossed on the waves for nine days, rested on Mount Parnassus. The deluge of Deucalion is supposed to have occurred B.C. 1503. =Dia´na.= The goddess of hunting. According to Cicero there were three of the name--viz.: a daughter of Jupiter and Proserpine, a daughter of Jupiter and Latona, and a daughter of Upis and Glauce. The second is the most celebrated, and all mention of Diana by ancient writers refers to her. To shun the society of men she devoted herself to hunting, and was always accompanied by a number of young women, who, like herself, abjured marriage. She is represented with a quiver, and attended by dogs. The most famous of her temples was that at Ephesus, which was one of the wonders of the world. =Dicta´tor.= A magistrate at Rome, invested with regal authority.