GLO 
reference ; and the whole are Circumscribed 
by well-designed figures of the constella- 
tions, faintly engraved. 
The great circles are divided into twenty 
minutes of a degree, and the equinoctial 
in addition into two minutes of time, so 
that, by estimation, the solution of pro- 
blems may be obtained to five minutes of a 
degree, or half a minute of time ; a degree 
of accuracy sufficiently useful not only for 
all the common problems, but most of the 
trigonometrical ones. 
As the reading off of time is found to be 
a ready and convenient method by hour 
circles attached to the meridians, the horary 
circle has been contrived to admit of be- 
ing slid away from its pole, upon the exte- 
rior edge of the meridian ; this is done, by 
making the extremity of the pole, which 
carries the index of the horary circle, 
moveable by unscrewing. The horary cir- 
cle being attached to the meridian barely by 
springs, when the index is unscrewed, the 
circle may consequently be slid to any part 
of the meridian. This contrivance is ne- 
cessary only for the circle of the north pole 
of Messrs. W. and S. Jones’s terrestrial 
globe, who have adopted this circle, and at 
the south pole of the globes have applied 
the interior brass index, or circles above- 
mentioned. 
Plates for the British globes of twelve 
inches diameter, have been reduced and 
abridged, from the eighteen inches above- 
mentioned. Plates for globes of nine, 
twelve, and twenty-one inches diameter, 
have been engraved by Mr. Cary, of the 
Strand. The stars of bis celestial globe are 
not circumscribed with the figures of the- 
constellations. 
GLOBULAR chart, a name given to 
the representation of the surface, or of some 
part of the surface of the terrestrial globe 
upon a plane, wherein the parallels of lati- 
tude are circles nearly concentric, the meri- 
dians curves bending towards the poles, 
and .the rhomb-lines are also curves. 
Globular sailing. See Sailing. 
GLOBULARIA, in botany, a genus of 
the Tetrandria Monogynia class and order. 
Natural order ot Aggregate. Lysimachiae, 
Jussieu. Essential character: calyx com- 
mon, imbricate; proper tubular inferior; 
corollets the upper lip, two-parted; lower 
three-parted ; receptacle chaffy. There are 
eight species. 
GLORIOSA, in botany, a genus of the 
Hexandria Monogynia class and order. 
Natural order of Sarmentace®. Lilia, Jus- 
GLTJ 
sieu. Essential character: corolla six-pe- 
talled, waved, reflex ; style oblique. There 
are two species, viz. G. superba, superb 
lily, and G. simplex. 
GLOSS, in matters of literature, denotes 
an exposition or explication of the text of 
any author, whether in the same language, 
or any other ; in which sense it differs little 
from commentary. y 
GLOSSOMA, in botany, a genus of the 
Tetrandria Monogynia class and order. 
Natural order of Rhamni, Jussieu. Essen- 
tial character : calyx turbinate four-toothed, 
superior ; corolla four-petalled ; anthers 
almost united, with a membranaceous scale 
at the end ; stigmas four, drupe. There is 
only one species, viz. G. guianensis, a na- 
tive of Guiana, flowering in September. 
Votomita is the vernacular name. 
GLOSSOPETALUM, in botany, a ge- 
nus of the Pentandria Pentagynia class and 
order. Natural order of Rhamni, Jussieu. 
Essential character : calyx very small, five- 
toothed ; petals five, with a strap at the tip 
of each; berry. There are two species, 
both lofty trees, natives of Guiana and 
Cayenne. 
GLOTTIS, in anatomy, the mouth or 
aperture of the larynx, through which the 
air ascends and descends in respiring. It 
can be dilated or contracted at pleasure, 
and by the various vibratory motions of 
which the tones of the voice are modified. 
The name was applied by the ancients to 
an additional moveable part of the flute, 
which they placed between their lips in 
performance, and which is supposed to have 
been similar to our reed. 
GLOW worm. See Lampyris. 
GLOXINIA, in botany, so Called in ho- 
nour of Ben. Petr. Gloxin, of Colmar, a 
genus of the Didynamia Angiospermia class 
and order. Natural order of Personate. 
Campanulaceae, Jussieu. Essential charac- 
ter: calyx superior, five-leaved; corolla 
bell-shaped, with the border oblique ; fila- 
ments, with the rudiment of a fifth, inserted 
into the receptacle. There is only one spe- 
cies, viz. G. maculata, spotted gloxinia, a 
native of South America. 
GLUCINA, in chemistry, an earth lately 
discovered by Vauquelin, while he was ana- 
lizing the beryl, to ascertain whether its 
constituent parts were the same as those of 
the emerald. See Beryl. In this expe- 
riment he found the glucina, which he so 
named from its sweetish kind of taste. 
Glucina, in the form of powder, or in frag- 
ments, is almost three times as heavy a# 
