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

G L A ( 722
Glkss of anthnony. See Chemi str y, p 87.
GLASTONBURY, a market town of Somerfetfhire,
five miles foiuh of Wells.
GLATZ, the capital of a county of the fame name in
Bohemia, 100 miles call of Prague: E. long. 160 S',
N. lat. 50° 25'.
GLAUBER’S salt. See Chemistry, p. 127.
GLAUCION, in ornithology. See Anas.
GLAUCIUM, in botany. See Chelidonium.
GLAUCOMA, in medicine, the change of the cryftal-
line humour of the eye into an azure-colour. See Me¬
dicine.
GLAUCUS, in ichthyology. SeeSquALus.
GLAUX, in botany, a genus of the pentandria mono-
gynia clafs. The calix confifts of one leaf; it has no
corolla ; the capfule has one cell, 5 valves, and 5
feeds. There is but one fpecies, viz. the maritima,
fea-milkwort, or glafs-wort, a native of Britain.
GLAZIER, an artificer who works in glafs. SccGlass.
The principal part of a glazier’s bufinefs confilts in
fitting panes and plates of glafs to the fafhes and win¬
dow-frames of houfes, pictures, &c. and in cleaning
the fame.
GLAZING, the polifiiing or crufting over earthen ware,
by running melted lead or litharge over it.
The common ware is glazed with a compofition of
50 lb. clean fand, 70 lb. lead afhes, 30 lb. wood-afhes,
and 12 lb. fait, all melted into a cake. With this
mixture they glaze it over, and then fet it in an earth¬
en glazing pan; taking care that the veflels do not
touch one another. As feveral colours are ufed for
this purpofe, we fhall give the following receipts,
from Smith’s laboratory. i.For a black, take lead-
afhes, 18 parts; iron-filings, 3; copper-alhes, 3; and
zaffer, 2 : this, when melted, will make a brown black;
and if you would have it blacker, put fome more zaffer
to it. 2. For blue, take lead-aflies, 1 lb. clear fand
or pebble, 2 lb. fait, 2 lb. white calcined tartar, ilb.
Venice or other glafs, x6lb. and zaflfer, halfapound:
mix them well together ; and after melting, quench
them in water, and then melt them again ; which ope¬
ration is to be repeated feveral times; and if you
would have it fine and good, it will be proper to put the
mixture into a glafs furnace for a day or two. 3- A
brown glazing may be given with a mixture of lead-
glafs, 12 parts, and common glafs and manganefe, of
each one part. 4. A citron yellow may be made of
6 parts of red-lead, 7 parts of fine red brick-duft, and
2 parts of antimony, all melted together. 5. A flelh-
colour, with 12 parts of lead-afhes, and one of white
glafs. 6 For a green-colour, take 8 parts of litharge,
8 parts of Venice-glafs, 4 parts of brafs-duft, and melt
them together for ufe; or melt together two parts
yellow glafs, with as much copper-duft. 7. For a
gold-yellow, take of antimony, red lead, and fand, an
equal quantity, and melt them into a cake. 8. For a
fine purple brown, take lead-alhes, 15 parts ; clear
fand, 18; manganefe, 1; white glafs, lymeafures;
and 1 of zalfer. 9. For a fine red, take antimony,
2 lb. litharge, 31b. ruft of iron calcined, 1 lb. and
grind them to a fine powder. 10. For a fine white
) G L O
glazing, take 2 lb, of lead, 1 lb. of tin, and calcine
them to allies ; of which take 2 parts; of calcined flint
or pebble, 1 part; of fait, ipart; and mixing them
well together, melt them into a cake. At Rotterdam,
they make a fine Ihining white glazing, by melting to¬
gether 2 lb. clean tin-alhes, lolb. lead alhes, 2 lb.
fine Venice-glafs, and \ lb. tartar. 11 A yellow gla¬
zing is made of 4 ounces of red lead, and 2 ounces of
antimony, melted together. 12. For a fine yellow,
take red lead, 3 pints; antimony and tin, of each 2 lb.
then melting them into a cake, grind it fine; and re¬
peating this feveral times, you will have a good yel¬
low.
GLEBE, among miners, fignifies a piece of earth, where¬
in is contained fome mineral ore.
Glebe, in law, the land belonging to a parilh-church,
befides the tithes.
GLECHOMA, in botany, a genus belonging to the di-
dynamia gymnofpermia clafs. The calix confids of
five fegments ; and each pair of'antheras are difpofed
in the form of a crofs. There are three fpecies, two
of which are natives of Britain, viz. the hederacea, or
ground-ivy; and the arvenfis, or upright ground-ivy.
The leaves of the hederacea are corroborant, aperient,
and detergent.
GLEDITSI A, in botany, a genus of the polygamia dicecia
clafs. The calix of the hermaphrodite has four fegments;
the corolla four petals; there are fix (lamina, and one pi-
(lillum. The calix of the male confifts of three leaves,
and the corolla of three petals ; and it has fix (la¬
mina. The calix of the female confids of five leaves,
and the corolla of five petals ; it has but one piftillum;
and the capfule is a legumen. There are two fpecies,
none of them natives of Britain.
GLEET, in medicine, the flux of a thin limpid hu¬
mour from the urethra. See Medicine.
GLIRES, the name of Linnaeus’s fourth order of mam¬
malia See Natural History.
GLENOIDES, the name of two cavities, or fmall de-
preffions, in the inferior part of the firft vertebra of
the neck.
GLI5, in zoology. See Sciurus.
GLISCHROMICTHES, in natural hiftory, themame
by which Dr Hill calls the tougher and more vifcid
loams.
GLISTER, in furgery. Clyster.
GLOBE, in pradlical mathematics, an artificial fphericaF
body, on the convex furface of which are reprefented
the countries, feas, (ire. of our earth; or the face of
the heavens, the circles of the fphere, &c. See Geo¬
graphy.
GLOBULARIA, in botany, a genus of the tetrandria
monogynia clafs. The common calix is imbricated ;
and the proper calix is tubular and below the fruit;
the upper labium of the corollulse is divided into two
parts, and the under one into three; and the recep¬
tacle is paleaceous. There are feven fpecies, none
of them natives of Britain.
GLOBULE, a diminutive of globe, frequently ufed by
phyficians in fpeaking of the red fpherical particles of.
the blood.
GLOCESTER.*