H E M 
HELVOETSLU'YS, a feapor-t town of Holland, on 
■the fouth fide of the ifland of Voorn, with a good har¬ 
bour, about twelve miles from the open fea, in the 
•middle of a large bay, capable of holding the whole 
.fleet of the country ; the town is filial], but well defended 
■with-ffxpng fortifications; this, in times of peace, is the 
genera! port for packets from England : twelve miles 
■weft of Dort, and fifteen fouth-wed of Rotterdam, Lat. 
51.48.N. Ion. 22. 35.-E. Ferro. 
HEL'YOT (Peter), a French Roman-catholic divine, - 
born at Paris in 1660. He embraced the ecclefiafiical 
life in the year 1683 ; and in the courfe of. his miflions 
he (made two journeys to Rome, and vifited the whole 
•of jltaly. In that country he made confiderable progrefs 
in preparing for the prefs an extenfive and laborious 
work, entitled A Hidory of the monadic Orders, reji- 
ious and,military, and of the fecular Congregations of 
oth Sexes. Having employed himfelf for more than 
twenty-five years on this work in Italy, he returned to 
France, where he was fucceffively chofen to fill the pod 
•of ftcretary in three provinces of his order. Thcfe fitiia- 
:tions furnidied him with the opportunity of collecting 
additional materials, and of finifhing the compofition of 
his work, In 1714 he began to print his Hiftory, in 
.quarto,; but died when the fifth volume was in the prefs, 
in 1716, when about fifty-fix years of age. - Four other 
volumes of this work were afterwards printed, under 
the infpeftion of father Maximilian Bril lot. This per¬ 
formance is held in much eftimation, on account of the 
learned refearch which it difplays. An abridgment of 
it was publifhed at Amfterdam, in 1721, in 4 vols. 8vo. 
Father Helyot.was alfo the author of borne devotional 
pieces, and of A View of the dying Clvriftian, i2mo, 
which has undergone various impreflions. - 
•HEL'WICK HEAD, a cape of Ireland, in the county 
of Waterford, on the fouth point of the entrance into 
DungarvanBay, Lat.52.2. N. Ion. 7.33.W. Greenwich. 
HELX'INE. See Convolvulus, Parietaria, and 
Polygonum. 
HELZ'STADT, a town of Germany, in the circle of 
Upper Saxony, and county oTMansfeld : nine miles 
north of Eifzlehen., and (ixteeri.fouth-fouth-eaft of Qued- 
linburg. Lat. 51. 35. N. Ion. 29. 6. E. Ferro. 
HEM,yi [hem, Sax.] The edge of a garment doubled 
and fewed to keep the threads from fpreading.—Row- 
lers muft be made of even cloth, white and gentle, 
without hem, or (earn. Wifeman's Surgery. — \_Hemmcn, 
Dut.] The noife uttered by a hidden and violent expi¬ 
ration of the breath.—I would try if I could cry hem, and 
have him. Shakefpeare. — InterjeEl. Hem! [Latin.] 
To HEM, v. a. To clofe the edge of cloth by a hem 
ordouble border fewed together.—To border; to edge: 
All the,fkirt about 
Was hem'd with golden fringe. Fairy Queen. 
Along the (hoar of filver-dreaming Thames, 
Whole rufliy bank, the which his river hems. Spenfc-r. 
To enclofe ; to environ ; to confine ; to Unit: perhaps 
always with a particle; as, in, about, round; 
What lets us then the great Jerufalem 
With valiant fquadrons round about to hem ? Fairfax, 
I hurry me in hade away, 
And find his honour in a pound, 
Flemm'd by a triple.circle round. Pope. 
To HEM, z). n. \_hemmen, Dut.] To utter a noife by 
■violent expulfion of the breath. 
HEM, pron. for] Them: , 
And fuch end perdy does all hem remain, 
That of fuch falfers’ friendfliip been fain. Spenfer. 
HEM, a town of Germany, in the duchy of Holdein : 
three miles fouth of Lunden. 
HE'MANyi [Heb. tumult.] A man’s name, 
HEMAT'ITES. See Hematites. 
Yol. IX. No. 593. 
H E M 3S5 
HEM'DA, a towji of Pcrfia, in the province of Irak: 
twenty-eight leagues ead of Ilpahan. 
HEM'ELAR (John), an eminent antiquarian, and 
canon of Antwerp, in the feventeenth century. He was 
born at the Hague; and wrote a work, entitled, Expo- 
fitio Nuinifmatum imperatorum Romanorum d Julio Cafare ad 
Heraclium ; which is very fcarce, though it has paded 
through fevera! editions. 
HE'MENGSTEDE, a town of Germany, in the duchy 
of Holdein : three miles north of Meldorp. 
HEMERALO'PIA,/ [Greek; from r^-ga., a day, and 
owlw, to fee.] A defeft of the fight, which conlids in 
being able to fee in the day-time, but not in the evening : 
in oppofition to nvx1tnAio7ntz, wherein the patient can fee 
only bv candle-light. 
HEMER'ALOPS, f. [Greek; from the day, 
and a-],, the eye.] One atfiifted with this deleft. 
HEMERES'IUS, adj. [Greek; from'-/j^Ega, a day.] 
Daily-; returning every day. 
HEM'ERIS,/! [Greek; from a day.] A fimple 
fever of one day’s continuance. • 
HEMEROBAF'TISTS,/ A feft among the ancient 
Jews, thus called from their waffling and bathing every 
day, in all feafons ; and performing this ablution with 
the greated folemnity, as a religious rite neceflary to 
falvation. Epiphanius, who cites this as the fourth 
hereby among the Jews, obferves, that in other points 
thefe heretics had nearly the fame opinions as the Scribes 
and Pharifees ; only that they denied the refurreftion 
of the dead, in common with the Sadducees, and retained 
a few other of the fchifms of thefe lad. The [efts who. 
■ pafs in the Ead under the denomination of Sabians, 
calling themfel-ves Mendai Iiahi, or the difdpUs of John „ 
and whom the Europeans entitle the Chrifiavs of St. John , 
becaufe they yet retain fome knowledge of the golpel, 
is probably of Jewilh origin, and fsems to have been 
deriyed from the ancient Hemerobaptids; at lead it is 
certain, that the perfon of John, whom they conlider as 
the founder of their fe6t, bears no'fort of fimiiitude to 
John the Baptid, but rather refembles the perfon of that 
name whom the ancient writers reprefent as the chief 
of the Jewilh Hemerobaptids. Thefe ambiguous Chrif- 
flans dwell in Perfia and Arabia, and principally at 
BalTora ; and their religion confids in bodily walhings, 
performed frequently, and with great folemnity, and 
attended with certain ceremonies which the priefts 
mingle with this fuperditious fervice. 
HEMERO'BIOUS, adj. [from the Greek aday, 
and fio;, life.] Poffeffing life only for one day. 
HEMERO'B IUS, f. [from the adj."] In entomology, 
a genus of infefts of;the order neuroptera. This genus 
is didinguilhefi by having the mouth armed with two 
teeth and four palpi ; the wings hang down, without 
being folded ; the antennae are fetaceous, advanced be¬ 
fore the head, and longer than the thorax, which is 
convex. 
Nature Teems to have fpread plant-lice, aphides, upon 
almod every plant for the maintenance of thoufands of 
her offspring. In their larva date, the hemerobii-are 
great devourers of thefe animals; and from that circum- 
dance they have obtained the name of lions of plant-lice. 
Even after'their transformation, the hemerobii retain 
their carnivorous habits : not fatisfiedwith making war 
upon plant-lice, who. tamely buffer themfelves to be de¬ 
voured, they do not [pare thole of their own kind. The 
momentthefe infefts enter upon life,-they find themfelves, 
by the precaution of their ancedors, iituated among 
thoufands of final 1.animals, which, without any effort, 
they dedroy. In lefs than a minute after the plant- 
loufe has-been feized, the whole vifeera and juices are 
fqcked from its body. Some fpecies make a covering 
for their body of the carcafes which they have thus 
emptied, and carry them about as trophies upon their 
backs. The eggs of the hemerobius offer a curious 
fpeftacle to the obferver, ahd for a long time were 
5 F deemed 
