_Encyklopadisches
Handbuch der Padagogik_ (Langensalza, Beyer), art. "Gemeinsame
Erziehung fur Knaben und Madchen," K. E. Palmgren is in favour of
co-education (vol. iii. of 2nd ed. 1905). See also W. Rein, _Uber
gemeinsame Erziehung von Knaben und Madchen_ (Freiburg, 1903), and
_Bericht uber den I. Internationalen Kongress fur Schulhygiene_
(Nurnberg, 1904), vol. ii. pp. 140 ff., "Co-education in der hoheren
Schulen." (M. E. S.)

COEFFETEAU, NICOLAS (1574-1623), French theologian, poet and historian,
was born at Saint-Calais. He entered the Dominican order and lectured on
philosophy at Paris, being also "ordinary preacher" to Henry IV., and
afterwards ambassador at Rome. In 1606 he was vicar-general of the
congregation of France, and received from Marie de' Medici the revenues
of the sees of Lombez and Saintes. He also administered the diocese of
Metz, and was nominated to that of Marseilles in 1621, but ill-health
obliged him here to take a coadjutor. Coeffeteau won considerable
distinction in the controversy against the Protestant reformers and also
wrote a _History of Rome from Augustus to Constantine_. Many of his
theological writings were collected in one volume (Paris, 1622), and at
the time of his death in 1623 he was engaged on a translation of the New
Testament which is still in manuscript.

COEHOORN, MENNO, BARON VAN (1641-1704), Dutch soldier and military
engineer, of Swedish extraction, was born at Leeuwarden in Friesland. He
received an excellent military and general education, and at the age of
sixteen became a captain in the Dutch army. He took part in the defence
of Maastricht in 1673 and in the siege of Grave in the same year, where
the small mortars (called coehorns) invented by him caused the French
garrison considerable trouble (Seydel, _Nachrichten uber
Festungskriege_, Leipzig, 1818). He was made a colonel for his gallant
conduct at the battle of Seneff (1674), and was present also at the
battles of Cassel (1677) and Saint Denis (1678).

The circumstances of the time and the country turned Coehoorn's
attention to the art of fortification, and the events of the late war
showed him that existing methods could no longer be relied upon. His
first published work, _Versterckinge de Vijfhoeks met alle syne
Buytenwerken_ (Leeuwarden, 1682), at once aroused attention, and
involved the author in a lively controversy with a rival engineer, Louys
Paan (Leeuwarden, 1682, 1683;