OPE 
to two kinds; viz. an union of parts, and a feparat 
of them: thus chemiftry either fepaates fpirits, falts, oan 
&c. or een them together 
A. chemical operatio > then, ‘confitts in — the 
fiuation “of the ber fome 
- fuch w 
fm kind: VIZ 
un nited, are 
or its calle 
owever, 
eeenten not reducible to citer ef them; but Boerhaave 
fhews, that it is a compofitio oth. 
Moft chem ifts, however, look on this gs as {carcely 
— and minute enough, ted foaailir into a 
umber of particular or fubordinate operatio a as calcina 
tions vitrification, diftillation, fblimation heb tia, er 
mation, fermentation, putrefa 
aoe het in n Theology, is afed for the actions, both of 
the Word and the man, . ar rift. See Per 
The cathe sok teach, there are two operations i in 
Jefus Chrift, the one e divine, Ge other human; and not o 
theandric operation, as was the doétrine of the ’ Monothelites 
and Monophyfites 
OPERATOR, i in Surgery, &c. a perfon who operates, 
or works with the hand, on the human body, to preferve or 
reftore its health. 
We fay an sida for the fione, meaning a lithotomift, or 
a perfon thee 
hay ane fr the Eyes, denotes a perfon who couches 
eataracts, 
iomap aie "foe the Teeth, fignifies a tooth-drawer, &c. 
See Treetn. 
OPERBANDA, in Geography, a town of Bengal; 25 
miles N.W. of Nagore. 
_OPERCULARIA, i in Botany, a genus of Gertner’s 
name is derived from o. erculum, a lid, becaufe oe 
aia Did. v. Ae Ait. Hort. 
232. rck Di 
(Pome a Rubioides ; Soland. 
i Mono, ea Nat. Ord. 
. Ch. Cal. Common patna “of one veal bell- 
ae permanent, containing three or fix flowers, with fix 
or nine acute, unequal teeth; proper perianth none. Cor. 
univerfal equal ; proper of one petal, funnel-fhaped, with a 
four or five-toothed, ereé& mouth. Fes Filaments le 
inferted into the receptacle ; 3; anthers men 
inferior, immerfed in the Hosea “iiyle desadtaneds 
ftigma thickifh, cloven. eric. none. Seeds folitary, con- 
don the other. Recept. common 
= 
t. 58. 
Msi. Jout and order. 
of the calyx 
Eff. Ch. Common haan be bell-thaped, fix or nog re 
with three or fix flowers. 
Partial calyx no 
corollas four or five-cleft, equal. eds nice, "eamerted 
in ag? receptacle. 
umbellata. Will Gertn. t. 24. (Pomax 
ambelaa ; aie MSS. oe umbellated, monan- 
drous.—Native o f New Holland. Stem round, hairy, with 
appolite branches. Leaves de falked, “plone, hairy 
OPH 
on both fides. Flowers terminal, umbellated. This fpecies 
is remarkable for having three feparate, three-toothed 
owers in the difk; a fingle flamen; and occafionally two 
2 0. afpera. Willd. . 2. 
de Muf. v. 4. 427. t. 70. f 
PP 
S 
Gertn. t.24. Juff. Annales 
(Rubioides mone Soland. 
MSS.)— Flowers ‘capitate, Calyx furrowed, fmooth. Na- 
tive of New Wales. Introduced at Kew j in 1790s 
by fir Jofeph Banks, where it flowers in June and July.— 
Stems upright, forked, round, furrowed, f{mooth. Leaves 
oppolite, erat-lncenate entire, feoeoth, veined. cower 
3. le voanes in ian, Soc. Tranf. v. 3. 30. 
Ait. Ho .2. V2 I~. Receptacle globular, 
chaffy.—Native ve of New South Wales. It flowers a 
Kew in July an guft. This new fpecies of Opercularia 
may peed be a diftine genus; at leaft‘fuch a fufpicion is 
ftarted Dr. g, who originally defcribed - it, 
fhould that opinion be eftablifhed, he propofes to call it 
Crypio/permum. ot perennial, fibro Stem herbaceous, 
ere 
acute, fometimes pointed, green.  Stipulas 
fhaped, greenifh. Flowers as Seba terminal, on longi 
ftalks, which at firft are ere&, th ‘a rooping, and after- 
wards become erect a fain. The w hole ae fins rather a 
ODER RCULUM, a lid, is exclufively aie for the finally 
are covering of the cap ee oe Cl 5 
is firmly united to their rim, conce: ring and 
fnges, till the feeds are ripe, It is itfelf concealed by the 
calypira cy veil, whofe point is, in a growing ftate, firm 
united wi ummit or centre of the lid, both together 
pear neni as it appears, the office of a ftigma. e lid 
18 always more or lefs convex, {ometimes hemifpherical, with 
a central bofs, or um 
one 
OvERCULUM, in the, Hiftory of Shell-ffh, denotes the 
cartilaginous cover with which nature has furnifhed the 
mouths of the hag waterefhells ; for as to the land 
ones, they have only a vifcid liquor to fupply the place of 
an operculum. 
OPEC, or Mumsacno, in Geogra flys a | a — 
but beautiful and fertile ifland of Mexico, wit 
the fame name, in the S. part of lake Nicaragua. 
OPFFERSHAUSEN, a town ae Germany, i in the 
county of Henneberg ; 7 miles N.W. of inungen. 
OPHEIM, a town of Norway, in the province of 
Bergen; 45 miles N.E. of Bergen 
OPHERA, or OPHER, in Seriptre coreregiys 2 a town 
of Judea, in the tribe of Benja: _ in. Jofh. x 
OPHIASIS. See Ato 
paegeeveee pier in n Nata Hiffory, the name of 
a gem mentioned by » he fays, was a black 
flone covered at top and bottom ‘ih phe this feems, 
without doubt, to have wellers. 
OPHICEEHALUS, a * Gobthgolgy. - pe of aa 
