HEM 
afpeé of a true Polpodi ium. The heaficts are oy Eide pin- 
natifid than in A. Oreopteris, but otherwife not very unlike 
that fern. They are fmooth, Siciich their talk and ribs are 
ly filky. 
a 2. H. japonica. Thunb. Jap. 333. Ic. fafc. 6.—* Frond 
deuhiy pinnate ; leaflets lanceolate, undivided.”*—Gathered 
Thunberg. aoe: wide “Aree is defcribed by 
im as f{mooth, with a furrowed ftalk ; the lower part 
megs & the upper fimply, idliste leaflets lanceolate, ac 
ivided, green above, pale benea The Seull ‘feation fs 
in three-forked lines, “fei all the under fide. 
MIOPE, or Hemiorvs, compounded ar ipacu:, half, 
and Fig: hole, a mufical panbaty in ufe among the ancients. 
miopus was a flute with only three {mall holes. 
HEMIOBIA fi pe in Surgery, a certain diforder of 
the eye in which the patient cannot, fee the whole of any 
obje which he is ob at, but only a part of it. Some- 
times he fees the middle, but not the circumference ; fome- 
times the circumference, but not the centre; while, on other 
a a it is only the he or_lower half which is dif- 
cerned a eee 
nit is page, tle beta cannot fee the lower ‘half of the 
object which is near him, becaufe it is impoffible for the rays 
of a from this part to reach the bottom of the eye; 
hence he only fees the upper part of the objeé. However, 
to 3 as, for inftance, letters, fmall' pieces of 
“money, &c.; but when the obje& is diftant, the rays of 
Bs both from its upper and lower part, ftrike the retina, 
s the Bad of it. _ Indeed, when he turns 
whole unt that patients 
of this defcription Saal get into a habit of fquinting. 
The diagnofis of this a is plain and obvious, and fe 
requifite treatment is elfewhere hea ued See CaTaRract ; 
neritic: of the Cornea. 
Under certain circumftan 
For exams they can hapa cal difc 
of an ol ee is near dnd of large fize, iol is go 
her om it, draw anh heads ls backscad or turn their 
eyes downy n certain occafions, the pupil becomes 
drawn away from the rnidite of the iris paneca or fide- 
ways to the margin of the cornea. one unnatural pofition 
of the pupil is alfo, under parti nmitances, accom- 
panied with hemiopi - FOr ete when the pupil is drawn 
downwards it is impoffible for the a to fee the upp 
part of a i Me clofe obje&, unlefs he either turns his eye 
very muc or removes to a greater diftance om 
what he is looking st. at. Rig nature of this cafe i is obvious ; 
but.a cure.is impractical 
It is the fame when, Tot fome caufe ‘or nay 
monly from external violence a’ lied to the eye, sy par 
of the ss ped ots le of th cor In this 
cake t the Ce pupil - rally 1 Ae) anda fern tang opening 
here the detachment 
eet this aperthte; nyhich is always next to hs happened of 
this ftatement ll applies to things of large fize, and not 
.as are fi 
HEM 
the cornea, ee patient naturally eon bo the lowe 
part of a near obje¢t, bie 1 fing ie opening to be at the 
upper margin ‘in of the c wev a "f he removes fur= 
ther from the objet, or hb bis eye very much downward, 
he is then able to fee the whole of it. The diagnofis of this 
cafe is alfo eafy, though no cure can be effected 
The fpecies of hemiopia, hitherto treated 6; are merely 
effe€ts of other difeafes. ‘The fourth kind is the moft im. 
portant, beg generally regarded as an independent diforder, 
It is of two forts, being fometimes denominated amaurofis 
dimidiata, which is a cafe that lafts a confiderable time, 
Sometimes it appears rather to be the effeét of a fudden and 
tranfient irritation, which is productive of a morbid fenfi- 
bility in the optic nerve. This latter cafe bears a clofe 
refemblance to one kind of 2 proceed from the 
fame caufes, and requiring the fam of treatment. The 
caufes, according: to Richter, are fer the moft part feated 
in the abdominal vifcera. “With regard to the firft kind of 
cafe, every thing faid iegaens gutta feréna is here appli- 
cable, the diforder i y terminating in amaurofis, 
Richter informs us of a man, who, erforming a journey 
on horfeback, in rainy weather, was Te through and through, 
and had ne opportun ity of changing his clothes for fome 
hours ; the confequence was, that the next morning he found 
he wit only able to fee the half of objects, which feemed to 
have a fwinging fort of motion. After a gentle evacuation 
rom the bowels, the complaint was cured 1 in Ned days by 
the tin@tura thebaica mixed with antimonial wine, blifters, 
and the vibe ammonice puree held before: the eyes In lefs 
wae 
of flic ht: colds ; but the patient at length got p pin 
rid of it after dili ently bathing his eyes, for a time, with ond 
water. See Ric st ine grunde der Wandarz 
kunft, Band 3. -Kapitel 17. 
HEMIPLEGIA, or 2 Hinsvirz mara pee | ve of # ips 
:, half ; and arrocw, I , or feize, in Medicine, 
of one whole fide of the body. See Patsy, ind Medical 
Evectriciry. 
HEMIPTERA, in Entomology, the fecond order in the 
Linnzan fyftem. 
The Gepaeee of the genus is taken from the fet of 
the mouth, and the fhape, texture, and pofition of at wing- 
cafes ; 3 the mouth is ‘bent in towards the breatt 
win, seers are foft 
Linnzus under thi 
Blatta, Mantis, Gryllus, Fulgora, €Seudes Notone 
Cimex, Aphis, Chermes, Coccus, and Thrips. 
In the works of Geoffroy, the infe&ts plbced by Linnseus 
in the order Hemiptera, form only a divition of the Ag oF 
tera, from which they are diftinétly removed by the 
and m ed ; membranaceous texture of t ol wed sae 
more: clear: the oblique pofiti tion 0 uture, the t 
inn fhe Big weaicentee 5 in the “toga Sr 
ae other at the margin, and forming a 2 an ae 
eens ed 
“The inftitution of the new order’ Hemipt 
an peo street in. the a peg en of iat i 
RSE ae, eS 
