FOE 
c? many lines, rays, &c. A fire-hearth. In phyfiology, 
a point in the mefentery, from whence tite origin of fevers 
were derived by 'lie ancients. In common fpeech, any 
point or center of motion or aCtion.—In no cafe can his 
majefty permit that Swedilh Pomerania Ihall become 
either the focus, or the theatre of war. King of Pruffa's De¬ 
claration, 1805. 
FO'CUS,/; in geometry and the conic feCtions, is ap¬ 
plied to certain points in the ellipfe, hyperbola, and pa¬ 
rabola, where the rays reflected from all parts of thefe 
curves concur or meet; that is, rays ifluing from a lumi¬ 
nous point in the one focus, and falling on all points of 
the curves, are reflected into the other focus, or into the 
line diredted to the other focus, viz. into the other focus 
in the ellipfe and parabola, and direCtly from it in the hy¬ 
perbola. Which is tbereafonof the name focus, or burn¬ 
ing-point. Hence, as the one focus of the parabola is at 
an infinite diftance ; and confequently all rays drawn front 
it, to any finite part of the curve about the vertex, are 
parallel to one another; therefore if rays from the fun, 
or any other objeCt fo diftant as that thofe rays may be 
accounted parallel, fall upon the curve of a parabola or 
concave fur face of a paraboloidal figure, thofe rays will 
all be reflected into its focus.—See Conic Sections, 
vol. v. p. 77. 
FO'CUS,/. in optics, is a point in which feveral rays 
meet, and are collected, after being either reflected or re- 
fraCted. It is fo called, becaufe the rays being here 
brought together and united, their force and effeCt are 
increafed, infomuch as to be able to burn; and therefore 
it is that bodies are placed in this point to be burnt, or 
to fhew the effeCt of burning glalTes or mirrors. It is to 
be obferved, in practice, that the focus is notan abfolute 
point, but a fpace of fome fmall breadth, over which 
the rays are fcattered ; owing to the different nature and 
refrarigibility of the rays of light, and to the imperfec¬ 
tions in the figure of the lens, &c. However, the fmaller 
the fpace is, the better or the nearer to perfection the 
machine approaches. Huygens (hews that the focus of 
a lens convex on both Tides, has its breadth equal to five- 
eighths of the thicknefs of the lens.—See Optics. 
FOCSA'NI, a town of European Turkey, in Molda¬ 
via, on the Milcou : fifty-four miles weft-north-weft of 
Galatz. 
FOD'DER,y. [po^pe, Sax.] Dry food ftored 
tip for cattle againft winter : 
Of grafs and fodder thou defraud’d the dams. 
And of their mothers dugs the ftarving lambs. Dryden. 
To FOD'DER, v. a. To feed with dry food.—Natural 
earth is taken from juft under the turf of the beft pafture 
ground, in a place that has been well foddered on. Evelyn. 
From winter keep, 
Well fodder'd in the ftalls, thy tender fheep. Dryden. 
FOD'DERER,/. He who fodders cattle. 
FODERTO'RIUM,y. in old records, forage, a provi- 
fion of fodder. 
FO'DIENT, adj. [ 'fodio , Lat. to dig.] Digging. 
FODI'NA,/. [Latin.] A mine, a quarry. 
FODI'NA, {fodio, Lat. to dig.] The labyrinth of the 
ear. 
FO'DUS, a town of Poland, in the Palatinate of Kami- 
niec : fifty-four miles north of Kaminiec. 
FOD'WAR, a town of Hungary, on the Danube, op- 
polite Colocza. 
FOE, J'. [pah, Sax. fae, Scot.] An enemy in war.— 
He fought great battles with his lavage foe. Spenfer. —A 
perfecutor; an enemy in common life.—Make good of 
bad, and friends of foes. Shakefpeare. 
Thy defeCts to know, 
Make ufe of every friend and every foe. Pope. 
An opponent; an illwiflier.—He that confiders and en¬ 
quires into the reafon of things, is counted a foe to re¬ 
ceived dodrines. Watts. 
Vol. VII. No. 447. 
FOG 529 
To FOE, v. a. To be a foe to.—Sith in his powre flte 
was to foe or friend. Spenfer. 
FO'E-PETOW'N E-HOTUN, a town of Chinefe Tar. 
tary : fixteen miles north of Petoune-Hotun. 
FO'EMAN, f. Enemy in war; antagonist An objolete 
word : 
What valiant foemen, like to autumn’s corn, 
Have we mow’d down in top of all their pride ! Shah fpeare. 
FCE'MINA,/] [Lat. fignifying a female.] The ful- 
phurof the old chemifts. 
FCE'MUND’s LAKE, a lake of Norway, thirty miles 
long, and from two to five wide, 130 miles north of 
Chriftiana. 
FCE'MUND’s RIVER, a river which rifes in a lake of 
the fame name in Denmark, and runs into lake Wenner, 
near Carlftadt, in Sweden. 
FCE'NERATED, adj. {feenus, Lat.] Put out to ufury. 
Scott. Not much ufed. 
FCENER A'-TION, f. [feenus, Lat.] The aCt of putting 
out money to ufury ; the profit arifing from money at 
ufe. Scott. Not much ufed. 
FCENI'CULUM,y in botany. See Anethum, Crith- 
mum, Pimpinella, Seseli, and Sison. 
FCENS (La), a town of Portugal, in the province 
of Beira : one league and a half north-eaft of Vifeu. 
FCE'NUM BURGUN'DICUM. See Medicago. 
FCE'NUM GREE'CUM. See Ononis, Trifolium, 
and T rigonella. 
FCETIFER'OUS, adj. [ foetus, young, and fero, Lat. 
to bear.] Fruitful; producing fruit. Not much ufed. 
FCE'TIFER, adj. [feetus, young, and facio, Lat. to 
make.] Making fruitful. Little ufed. 
FOE'SIUS, or Foes (Anutius), a learned phyfician, 
born at Metz, in 1526. After ftudying philofophy and 
phyfic at Paris, and taking his degree of doCtor, he re- 
turned to his own country, where he praClifed, during 
forty years, with great reputation. He firft publilhed, 
in 1560, a Latin verfion, with copious commentaries, of 
the fecond book of Flippocrates on epidemics; which 
was followed by his (Economia Hippocratis, an alphabe¬ 
tical explanation of all the terms, efpecially the more ob- 
feure ones, ufed by that writer. The reputation he ac¬ 
quired by thefe performances caufed him to be folicited 
to give a complete edition of the works of Hippocrates. 
For thispurpofe he collated various manuferipts, added 
a new verfion and commentaries, and at length publilhed. 
Opera omnia Hippocratis qua fuperfunt, a vols. folio, 
Francf. 1595. Thisedition is much fuperior to all which 
had preceded, and the author is reckoned by the learned 
Huet one of the beft tranftators from the Greek. He 
likewife publilhed Pharmacopoeia Mcdicamentorum omnium 
qua hodie in officinis extant, 1561, 8vo. He died in 1596. 
FCE'TOR,/. [faeteo ,, Lat. to ftink.] A ftink or ill fa- 
vour ; any fetid effluvia. 
FCE'TUS, f. [Latin, from feo, to bring forth.] The 
child in the womb after it is perfectly formed, It is ap¬ 
plied to the young of all viviparous animals whilft in the 
womb; and of all oviparous animals before they are 
hatched.—See thearticle Conception, vol. v. p. 4-12, 
and the correfponding Engraving ; alfo Anatomy of the 
Gravid Uterus, vol. i. p. 641-632. 
FOG, f. [fog, Dan. a ftorm.] A thick mill; a moift 
denfe vapour near the furface of the land or water.—Left, 
fer mills and fogs than thofe which covered Greece with 
fo long darknefs, prefent great alterations in the fun and 
moon. Raleigh. 
Fly, fly, prophane fogs! far hence fly away; 
Taint not the pure dreams of the fpringing day 
With your dull influence : it is tor you 
To fit and fcoule upon night’s heavy brow. Crafhato. 
The offenfive fmell which ufually accompanies the fogs 
of London, and the vapours arifing from fens and boggy 
places, is fuppofed to arife from the impure water being 
r 6T decompofedj 
