CLAUSEWITZ, KARL VON, a Prussian general, born at Burg; distinguished himself against Napoleon in Russia in 1812; an authority on the art of war, on which he wrote a treatise in three volumes, entitled “Vom Krieg” (1780-1831).

CLAUSIUS, RUDOLF, an eminent German physicist, born at Koeslin, in Pomerania; professor of Natural Philosophy at Bonn; specially distinguished for his contributions to the science of thermo-dynamics, and the application of mathematical methods to the study, as also to electricity and the expansion of gases (1822-1888).

CLAVERHOUSE, JOHN GRAHAM OF, VISCOUNT DUNDEE, commenced life as a soldier in France and Holland; on his return to Scotland in 1677 was appointed by Charles II. to the command of a troop to suppress the Covenanters; was defeated at Drumclog 1679, but by the help of Monmouth had his revenge at Bothwell Brig; affected to support the Revolution, but intrigued in favour of the Stuarts; raised in Scotland a force in their behalf; was met at Killiecrankie by General Mackay, where he fell (1643-1689).

CLAVIERE, Minister of Finance in France after Necker, born at Geneva; projector of the Moniteur; friend of Mirabeau; committed suicide in prison (1735-1793).

CLAVIJE`RO, a Jesuit missionary, born in Vera Cruz; laboured for 40 years as missionary in Mexico; on the suppression of his Order went to Italy, and wrote a valuable work on Mexico (1718-1793).

CLAVIGO, a drama by Goethe in five acts, the first work to which he put his name; was received with disfavour.

CLAVILENO, Don Quixote’s wooden horse.

CLAY, HENRY, an American statesman, born in Virginia; bred for the bar, and distinguished for his oratory; was for many years Speaker of the House of Representatives; was a supporter of war with Britain in 1812-15, and party to the treaty which ended it; was an advocate of protection; aspired three times unsuccessfully to the Presidency; his public career was a long one, and an honourable (1777-1852).

CLEAR THE CAUSEWAY RIOTS, bickerings in the streets of Edinburgh in 1515 between the rival factions of Angus and Arran, to the utter rout of the former, or the Douglas party.

CLEANTHES, a Stoic philosopher, born at Assos, in Troas, of the 3rd century B.C.; wrought as a drawer of water by night that he might earn his fee as pupil of Zeno’s by day; became Zeno’s successor and the head of his school; regarded “pleasure as a remission of that moral energy of the soul, which alone is happiness, as an interruption to life, and as an evil, which was not in accordance with nature, and no end of nature.”

CLEAR, CAPE, a headland S. of Clear Island, most southerly point of Ireland, and the first land sighted coming from America.

CLEARCHUS, a Spartan general who accompanied Cyrus on his expedition against Artaxerxes; commanded the retreat of the Ten Thousand; was put to death by Tissaphernes in 401 B.C., and replaced by Xenophon.