MONAD, the name given by Leibnitz to one of the active simple elementary substances, the plurality of which in their combinations or combined activities constitutes in his regard the universe both spiritual and physical; it denotes in biology an elementary organism.

MONAGHAN (82), an inland Ulster county, Ireland, surrounded by Louth, Armagh, Tyrone, Fermanagh, Cavan, and Meath; is undulating, with many small lakes and streams; grows flax and manufactures linen, and has limestone and slate quarries.  The chief towns are CLONES (2), and the county-town MONAGHAN (3), which has a produce market.

MONBODDO, JAMES BURNETT, LORD, a Scottish judge, born in Kincardineshire, an eccentric writer, author of a “Dissertation on the Origin of Language” and of “Ancient Metaphysics”; had original fancies on the origin, particularly of the human race from the monkey, conceived not so foolish to-day as they were then (1714-1799).

MONCREIFF, SIR HENRY WELLWOOD, Scottish clergyman, born at Blackford; from 1775 to 1827 minister of St. Cuthbert’s, Edinburgh, and leader of the evangelical party of the Scottish Church.

MONCREIFF, JAMES W., LORD, second son of preceding, eminent Scottish judge; was the author of the Veto Act which led to the Disruption of 1843 (1776-1851).

MONCREIFF, SIR HENRY W., son of preceding, became a Free Church minister, and was Principal Clerk of the General Assembly of the Free Church; an authority on Church law (1809-1885).

MONCREIFF, JAMES, brother of preceding, bred for the Scottish bar; was Lord Advocate of Scotland under four administrations; was appointed Lord Justice-Clerk in 1860; was raised to the peerage in 1874 (1811-1895).

MOND, LUDWIG, distinguished technical chemist and inventor, born at Cassel, in Germany; was a pupil of Kolbe and Bunsen, and has made important additions to chemical-industrial processes and products; b. 1839.

MONEY, defined by Ruskin to be “a documentary claim to wealth, and correspondent in its nature to the title-deed of an estate.”

MONGE, GASPARD, celebrated French mathematician, born at Beaune; one of the founders of the Polytechnic School in Paris (1746-1818).

MONGOLS, a great Asiatic people having their original home on the plains E. of Lake Baikal, Siberia, who first rose into prominence under their ruler Genghis Khan in the 12th century; he, uniting the three branches of Mongols, commenced a career of conquest which made him master of all Central Asia; his sons divided his empire, and pursued his conquests; a Mongol emperor seized the throne of China in 1234, and from this branch sprang the great Kublai Khan, whose house ruled an immense territory 1294-1368.  Another section pushed westwards as far as Moravia and Hungary, taking Pesth in 1241, and founded the immense empire over which Tamerlane held sway.  A third but later movement, springing from the ruins of these earlier empires, was that of Baber, who conquered India, and founded the Great Mogul line, 1519.  Now Mongols are constituent elements in the populations of China, Russian, and Turkish Asia.