Encyclopaedia Britannica; or, A dictionary of arts and sciences, compiled upon a new plan … > Volume 2, C-L

COR ( 2I
Co rrector, in medicine and pharmacy, an ingredient
in a compofition, which guards againft or abates the
force of another.
CORRELATIVE, fomething oppofed to another in a
certain relation. Thus, father and fon are correla¬
tives. Light and darknefs, motion and reft, are cor¬
relative and oppofite terms.
CORRIGIOLA, in botany. See Illecebrum.
CORROBORANTS, or Corroborative medicines.
See Strengtheners.
CORROSION, in a general fenfe, the addon of gnaw¬
ing away, by degrees, the continuity of the parts of
bodies.
Corrosion, in chemiftry, an adlion of bodies,' by
means of proper menftruums, that produces new com¬
binations, and a change of their form, without con¬
verting them to fluidity. See Chemistry.
CORRUGATOR, in anatomy. See Vol I. p. 291.
CORROSIVES, in furgery, are medicines which cor¬
rode whatever part of the body they are applied to:
fuch are burnt* alum, white precipitate of mercury,
white vitriol, red precipitate of mercury, butter of
antimony, lapis infernalis, <bc.
CORRUPTION, the deftruddon, extindlion, or, at
leaft, ceflation for a time, of the proper mode of ex-
iftence of any natural body. See Putrefaction.
Corruption cf blood, inlaw, an infedlion accruing to
a man’s ftate, attainted of felony and treafon, and to
his iflue ; for as he lofes all to the prince, <bc. his
iffue cannot be heirs to him, or to any bther anceftor
by him : and if he were noble, his heirs are rendered
ignoble.
CORSA, in architedture. See Plat-^w*/.
CORSAIR, a pirate, or perfon who fcours the fea for
plunder, with an armed veflel, without commiflion
from any prince or power. A corfair differs from a
privateer, in that the latter adls under a commiffion,
and only attacks the veffels of thofe at war with the
ftate whence he had his commiffion.
CORSELET, a little cuirafs; or, according to others,
an armour or coat made to cover the whole body,
anciently worn by the pike-men, ufually placed in the
front and flanks of the battle, for the better refilling
the enemy’s affaults, and guarding the foldiers placed
behind them.
CORSICA, an ifland in the Mediterranean, between
8° and io° E. long, and between 410 and 430 N.
lat. about one hundred miles fouth of Genoa, and fub-
je£l to that republic; though the natives for many
years difputed their right. This ifland is now in the
hands of the French, after a glorious ftruggle for li¬
berty under general Paoli.
CORTEX, or Cortex Peruvianus. See Cin¬
chona.
Cortex cerebri. See Vol. p. 285.
CORTONA, a city of Tufcany, in Italy, about thirty-
five miles fouth-eaft of Sienna : E. long. 136, and
N. lat. 430 15'. /
'CORTUSA, in botany, a genus of the pentandria mo-
nogynia dafs. The cbrolla is rotated, with an open
2 ) COR
limbus; -and the capfule has two valves. There are
two fpecies, none of them natives of Britain. ’
CORUNNA, or Groyne, a port-town of Gallicia in
Spain, fituated on a fine bay of the Atlantic ocean, a-
bout thirty-two miles, north of Compoftella: W. long.
90, and N. lat. 430.
COR-US, in Jewifli antiquity. See Homer.
Corus, in our old writers, denotes eight buftxels, or a
quarter.
Corus is alfo a wind, fo called by the Jews, rifing in
• the fummer in the weft ; and is that at prefent called
„ the north eaft-wind.
CORUSCATION, a glittering, or gleam of light iffu-
ing from any thing "it is chiefly ufed for a flalh of ‘
lightening darting from the clouds in time of thunder.
CORVUS, the Raven, or CRow-kind, in ornithology,
a genus of birds, of the order of picss, the diftin-
guiftiifig charadteriftics of which are thefe : The beak
is convex and culrrated; the noftrils are covered with
briftly feathers; the tongue is forked and cartilaginous;
and the feet are of the walking kind. The fpecies are
nineteen, viz. 1. The hottentottus, is of a greenilh
black colour, with long myftaches, and an equal tail.
It is found at the Cape of Good Hope. 2. The co¬
rax, or raven of Englifti authors, is black, with a
bl/ieilh back, and a roundifli tail. It is a native of
Europe, and feeds upon carrion: it is much’given to
the'ft, and may be taught to utter articulate fotinds.
3. The corone, or carrion-crow, is of a black blueifli
colour, with the prime wing-feathers ftiarp, and a
round tail: it lives upon carrion and fruits, and is a
native of Europe. 4. The frugilegus, or rook, is
black, with an alh-coloured forehead, atid a roundifli
tail. The rooks affemble in flocks, and infeft the
corn-fields : many of them fleep together in the fame
tree, by which means they are eafily taken, j. The
cornix, or royfton-crow, is afti-coloured, with the
throat, wings, and tail black. It feeds upon worms,
fnails, frogs, caterpillars, 6. The monedula,
or jack-daw, is of a dulky colour, with a hoary hind-
head ; and the wysgs, tail, and forehead black. It is
a native of Europe. They flock together in winter,
fleep, and build their nefts in old turrets and walls.
7. The glandularius, or jay, has blueifli wings, with
tranfverle black and white lines ; and the body is va¬
riegated with an iron-colour. It is a native of Europe,
and feeds upon nuts, corn, and fometimes fmall birds.
8. The criftatus, or blue-crefted jay, has the covert
feathers of the wings marked with tranfverfe black
lines, a blueifli body, and a black collar. It is a na¬
tive of North America. 9. The cayanus, is of a vio¬
let colour above, and white below, with a black front
and throat, and the point of the tail white: the fea¬
thers of the hind head are eredl and rigid. It is a
native of Cayenne. 10. The caryocatadles, is brown,
'and fpotted with white ; the wings and tail are black;
the prime tail-feathers are white at the points, but the
intermediate ones have a worn appearance. It is a na¬
tive of Europ*e, and feeds upon nuts. it. The bali-
caffius is of a greenifti black colour, with a forked tail.
It