Ox Y 
difcovery was certainly an a of mine, though I be- 
lieve not made “ae foe 
xygen gas may be el from a variety of fources, 
but two only are generally had recourfe to. For delicate 
peda Sacra where is pe eas to be abfolutely pure, it 
y be obtained by heating the compound termed aches 
One hu 
of great purity. For ‘all ie common Roe of experi 
ment, however, i be procured heati 
in an earthen or iron retort, the fubftance called black oxide 
of manganefe, of w und in aff 
about 140 bic inches, of tolerably pure gen gas 
This of manganefe is a very abundant ae it fhould 
rom impuri 
0 or red a ‘of lead, 
and feveral other fubftances containing oxygen, afford it 
when heated to rednefs. 
xyg 
manganefe 
acid (oil of vitriol) ; 
of the gas 
See renee Sie 
there until the whole of the mean is a which is 
known by the frefh pieces of the cance remaining ays 
the gas is then decanted into another veffel, a e- 
garded as perfe@tly pure. on -” ftate it ‘ton oe fol. 
lowing charateriftic properti 
It is permanently elaftic an “all known ae 3 CO- 
lourlefs, tranfparent, and without f{mell an e. 
It is re aac nd may be breathed for ine time with- 
out inconv 
Its {pe cific nag, compared to atmofpheric air, is as 
00; to 
rature and preffure, 100 cubic inches weigh 34 grains. 
t In oxygen gas, it 
burns with greatly increafed f{plendour, aad is much more 
rapidly confumed than in atmoipheric air ; and when the 
wick is merely .glowing, it is inftantly rekindled with a flight 
explofion en fteel or iron wire, with a bit of inflamed 
wood attache d to it, is introduced into the gas, the metal 
burns with great brilliancy, and throws off white hot {parks 
and globules, confifting of the protoxyd of iron, When 
fulphur, phofphorus, or charcoal, are burned in oxygen, the 
* prefent in ‘all cafes of combuttio 
OXY 
ashen is intenfely vivid, and pias are formed by the 
di This 
many inftances the abforption of oxygen 
gives rife to alkaline and earthy produéts, fo that the term 
Is very objeCtionable. 
Conceiving that fo powerful a fupporter hes combutftion 
as this gas muft in itfelf contain little or ee 
Dr. Prieftley termed it dephlogifficated air. ‘See Com 
BUSTI 
The French theorifts confidered oxygen as neceffarily 
b under which article will 
ee OxymMU 
O a is very {paringly abi d by water; whea 
that fluid hae | en deprived, by boiling, of the atmo{pheric 
air which it rane it takes up ;',th its bulk of oxygen, 
at the temperatu 
If the ciabe ‘sprang oxygen be deduced from the 
analyfis of water, (fee Hyprocen and WaTER 
a5, ’ 
URIATIC 
r if, 
compofe oxygen + 2 hydrogen, will be reprefent- 
ed hy the number 17, inftead of 8.5, as in the former 
ce. 
OXYGENATION, in ne eter the a& of uniting 
with different _ when : say with 
y the ancients to reg 
a liquor made of a mixture of honey, water, and vinegar. 
OXYGON and yurn, 
angle, in Geometry, acute-angled ; a figure coufitng wholly 
oF acute angles, or angles Tefs than ninety degre 
The word is chiefly applied to triangles, a iy the three 
angles are all acute, or lefs than ninety degrees eac 
OXYL , a word ufed by fome author name 
or bread, which has a mixture of vinegar in ra pee 
fometimes for sy ae fometimes for medicinal ufes. 
OXYLOBIUM, in Botany, from of Us ‘foarp, and Aofo:, 
a pod or legume, aindag to the fharp point or Peale of that 
part. Andr. Repof. 492. Brown in Ait. Hort. Kew. v, 3. 
. Clafs ané@ order, a Cea "Nat. Ord. 
se eae Lion. Legum 
Cal. Poca: ene, “fomewhat two-lipped, 
in ais pay fegments, without appendages ; the three lower 
ones rather mott deeply feparated, 
five petals; ftandard roundifh, broa 
wings obovate, a little fhorter than the ftandard, oblique at 
the bafe, with fhort, lingar sa Ne keel compreffed, as long 
5 
