HEM 
very painful 2 oo although not uncom- 
m been mentio: medical writers, or 
has been See with the é douleureux. It confilts of 
quoag. _ 
flure. The 
orbital nerve, becomes todos to Fie touch. ‘This pai 
oe duration of two or 
obferved it to recur in the evenin r. Darwin fays that 
the peri ometimes correfpond with alternate lunar or 
folar na like tertian agues ; t at other times they 
s, this hemicrania is is obvioufly connected 
ora = aaiatioccd ftate of the digeftive organs ; 
it has occurred along with catarrh ; and in others 
again it has been produced by fatigue, watching, intenfe 
itudy, or fome other —_ of debility. Dr. Darwin con- 
fiders it as fometimes by a deciiying tooth, efpe- 
cially the — Sihinitin; or laft tooth of the upper jaw, 
which frequently decays firft. ( See Zoonomia, clafs 4. 2. 2 
ead, on the fame fide, which 
is enue called the sitaes be tlepege It more eS 
we believe, produces the ear 
This difeafe differs altogether from the tic doulcureux, 
the regularity of its diurnal periods and intermiffions, wd 
Jength of both. In the #ic, the pain comes on fud- 
denly and is excruciating ; it latts but a fhort time, perha 
oO a 
HEM 
Darwin recommends the cinchona in combination with opium, 
after an evacuation by purging» or flight blood-letting, A 
remedy was propofed b avidfon, which we have fome- 
times found to fucceed in preventing the acceffion, and in 
curing the difeafe ; name ly, a large dote of ther taken at the 
ork ; viz. four or five drops of the rp sate of arfenic, 
prepared according to that phylician’s formula, taken twice 
or three times a day. ‘The efficacy of this remedy hasa 
peared to be fuch, as almoft to entitle it to the apelin 
of a See againit this difeafe. The fevere meafure of di- 
viding the affected nerve, as it paffes through the foramen, 
has been reectariended and occafionally executed, we be- 
lieve, with precarious fuccefs; but the expedients above- 
mentioned fuperfede the neceflity of the knife. 
not feen the megrim affecting the fecond, or infra-orbital 
branch of the fifth pair of nerves, i is occafionally the 
feat of tic douleureux. See Tic 
HEMICYCLE, Hemicyexivum, coinponiied of npvorcy 
half, and oes circle, a femicircle. 
EM is particularly applied, in Architedure, to 
vaults in og cradle form ; and arches, or fweeps, of vaults, 
SES a perfect fewiices rele. 
onftru& an arch of hewn {ftone, wees divide the = 
cycle iat fo. many vouffoirs ; taking care to make 
uneven ganas that there ~ no joint in the middle, wile 
the key-{tone fhould be EY and BrIpGE. 
HE +e sar ee was ios a ase of the orcheftra in the an- 
~ —— 
4 
e 
; 
oO 
| 
ens. 
The ancients ie alfo a fort of fun-dial, called Aemic = 
chum. It was a concave ee the upper end, or culp, 
whereof looked to the n 
There was a 
HEMIDESMUS, = Botany, from tpsvty half, a and 
Stspor, a tie or attachment, on account of the filaments being 
united in their lower te though feparate in the upper 
Brown. Afclep. from the Tranfs Werne 
Society at Edinburgh, 45.—Clafs and — cn 
Digynia. Nat. Ord. Contorte, Linn. Apocine “ 
Eff. Ch. Corolla wheel-fhaped, with five ‘hiuf fens fcales at. 
ren bring it on in fome perfons; talking, or the its finufes. Filaments united at the bafe, fe 
leaft motion of the face, affe&s ihanarea" (See a paper Anthers cohering, beardlefs, fimple at the fummit, uncon- 
en “ a painful affeCtion of the face,’? in the Med. Obi. and need with ftigma. Mafles of pollen 20. Stigma 
Inquiries, vol. v. page 131.) In thefe points the two dif- pointlefs. Follicles cylindrical, widely +s preading, {mooth. 
orders are perfectly diftin&; not to mention the o ftinacy ds crowned with hair. : ‘ 
and permanency of the tic douleureux, and the as facility This genus, feparated by Mr. Brown from P sire 
of curing the megrim, or intermittent hemicrani which it is very nearly akin, confifts of P. indica lofel 
this difeafe, the bark of cinchona has neus, and two other fpecies hitherto undefcribed, clolely 
na deel of the biteenelioes with related to each other. They are fmooth wit toca 
re pee ps often with oppofite fhining leaves and -—_ mk ge whic! peed 
oS lee E Aakdortee: Morton in — os tufts from between the footitalks peste? 
affirm rder i ne ig two days by means Eat or falles 
| refitted blifters, emetics, ca- HEMIDIAPENTE, in in fe = femi-diapente oF ( 
thartics, and other remedies for feveral weeks ; one flat, or imperfect fifth, is whofe ratio is 3% 3 
s Aaya list on (See his Phthifiologia, ex. I. cap. 9.) 3115+ 6f + 27m. Se Flat on . HEMI- 
