I1EM 
gynia class and order. Natural order of 
Lilia, or Liliaceae. Coronariae, Linnaeus. 
Narcissi, Jussieu. Essential character: co- 
rolla bell shaped ; the tube cylindric ; sta- 
mina declining. There are five species. 
HEMIMERIS, in botany, a genus of the 
Didyuamia Angiospermia class and order. 
Natural order . of Personate. Scrophulariae, 
Jussieu. Essential character : calyx five- 
parted ; corolla wheel-form ; upper lip clo- 
ven, with a nectareous bag at the base. 
There are three species. 
HEMIONITES, in botany, English mule 
fern, a genus of the Cryptogamia Filices, or 
Ferns. Generic character : capsules digest- 
ed into lines, meeting together, either in- 
tersecting each other, or branched. There 
are eight species, natives of both Indies. 
^HEMISPHERE, in geometry, the half 
of a globe or sphere, when it is supposed to 
be cut through its centre in the plane of 
one of its great circles. Thus the equator 
divides the terrestrial globe into the north- 
ern and southern hemispheres : in the same 
manner the meridian divides the globe into 
the eastern and western hemispheres ; and 
the horizon into two hemispheres, distin- 
guished by the epithets upper and lower. 
See Globe and Sphere. * 
The centre of gravity of an hemisphere is 
five-eighths of the radius distant from the 
vertex. 
Hemisphere is also used to denote a 
projection of half the terrestrial globe, or 
half the celestial sphere, on a plane, and 
frequently called planisphere. 
HEMISTICH, in poetry, denotes half a 
verse, or a verse not completed. 
Of this there are frequent examples in 
Virgil’s Erie id ; but whether they were 
left unfinished by design or not is disputed 
among the learned; such are, “Ferro ac- 
cincta vocat,” /Err. II. y. 614. And “ Italiam 
non sponte sequor,” En. IV. v. 361. 
HEMP. See Cannabis. 
The cannabis sativa, or hemp-plant, is 
cultivated on account of its external fila- 
ments, which constitute the hemp used for 
cordage, canvass, cloth, &c. and the seeds 
abound with oil. This plant is annual ; it 
rises quick into a tall slender sort of shrub • 
its leaves growing by fives or sixes from the 
same pedicle, are a little jagged, and yield 
a strong smell which affects tire head. The 
culture and management of hemp makes a 
considerable article in agriculture ; requir- 
ing divers operations, as pulling, watering, 
beating, and swingling. It is sown in May, 
in a warm, sandy, rich soil ; and is of itself 
HEP 
sufficient to destroy weeds on any ground. 
The first season for pulling hemp is usually 
about the middle of August, when they be- 
gin to pull the male plants, called fimble 
hemp. But the safer method is to pull it a 
fortnight or three weeks later, when the 
male plants have fully shed their farina, 
without -which the seeds will prove only 
empty husks. At the second pulling, a 
little after Michaelmas, the female plants, 
called karle hemp, are taken out of the 
ground. This karle hemp is laid in tile sun 
to. dry, and then housed, for the seed to be 
thrashed out. The female hemp alone pro- 
duces seed to perpetuate the kind. The 
operations of barling, watering, breaking, 
swingling, and heckling hemp, are very 
much like those practised in the dressing df 
flax. The hemp imported into this country 
chiefly comes from Russia. Amongst it the 
Riga hemp deserves the preference, which 
according to the quality, is divided in 
rhyne, oulshot, pass, and eodilia hemp. 
The Italian, known in this country by the 
name of Bologna hemp, is of very prime 
quality, but comes too dear for the con- 
sumption of the northern parts of Europe. 
The best hemp should be clean, soft, ten- 
der, of long staple, and a sound palish-yel- 
low colour, neither green nor red. 
HEMIPTERA, half-winged, in natural 
history, the second order of insects, accord- 
ing to the Lipnaean system. In this tribe 
the upper part of the wing-sheaths is of a 
tough or leathery texture ; the lower part 
is membranaceous. Sometimes almost the 
whole wing-cover is leathery, but of a softer 
texture than the coleoptcra. Grasshoppers, 
locusts, and the cicadas, are contained in 
this division. The wing-covers in this order 
cross each other when closed, instead of 
meeting in a direct line. This order con- 
tains the follovying genera : 
Aphis Mantis 
Blatta Nepa 
Chermes N otoneeta 
Cicada Papilio 
Cimex Fhalasna 
Coccus Pneumora 
Fulgora Sphinx 
Grylius Thirips 
Macrocephalus 
HENDECAGON, in geometry, a figure 
that hath eleven sides, and as many angles. 
HEPAR sulpliurus, liver, of sulphur, a 
combination of alkali and sulphur. See 
Sulphuret. 
HEPATIC, in medicine and anatomy, 
any thing belonging to the liver. 
