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grammarians whose works arc extant. lie was a Christian ; anilaccording to some, the sa ne with Hesyclmis, patriarch of Jerusa-lem , who died in 609. lie wrote a Greek Lexicon, which, in theopinion of Casanhon, is the most learned and useful work of thatkind produced hy the ancients, Schrevoiius published a goodedition of it in lfifis, in quarto, with notes; but the best are thoseof John Alberti, printed at Leyden in 1746, and Ruhnkenius, in1766; both in two volumes fo jo.

HE I KK 1A11C11, or II ETERIARCH A, [^vinonj.ya, from/Ttsqsf, an ally, and command,] in antiquity, an ollicer in theGreek empire, whereof there were two species; the one called •simply lieteriarch, and the other great heieriarch, who had the di- |rection of the former. Their principal function was to command Ithe troops of the allies; besides which, they had some other duties!in the emperor’s court, described by Godin : lie otticiis, cap. 5,H. 30, 31, 32, 37.

UETEROCLiTE, or IlKTEROCLITON, [from 'r^ ; , an-other, and xxivu.-, to decline,] in grammar, an anomalous word,which either in declension, conjugation, or regimen, deviates fromthe ordinary rules of grammar. It is-peculiarly applied to nounswhich vary or are irregular in declension ; having fewer cases,numbers, &c. than ordinary ; or that o. one declension in onenumber, and another: Hoc ran, vans-, hire vasa, -casontm.

HETERODOX, [triage and JojV] in polemical theology,any thing contrary to the frith and doctrines of a true church.

H ETF.RODROM US VKCT1S, in mechanics, a lever, where-in the fulcrum, or point of suspension, is placed between thepower and the weight. See Lever. i

HETEROGENEITY, [it.j*, and yuo,-,] in physics, that qua-lity or property of bodies which denominates a thing heteroge- |neous. The word is also for the heterogeneous parts themselves.In which sense the heterogeneities of a body are the same thingyyith the impurities thereof.

HETEROGENEOUS, or H ETEROGENEAL, somethingthat consists in parts of dissimilar kinds, in opposition to homo-geneous. see Homogeneous.

Heterogeneous, in mechanics, such bodies whose density isunequal in different parts of their bulk.

Heterogeneous Light, is, by Sir Isaac Newton , said to bethat which consists of rays of different degrees of refrangibility :thus the common light of the sun or clouds is heterogeneous ; be-ing a mixture of all sorts of rays.

^Heterogeneous Nouns, one of the three variations in irre-gular nouns ; or such as are of one gender in the singular number,and of another in the plural, as hoc cesium, hi ca'li. Heterogeneous,under which are comprehended, mixed nouns, are six-told. 1.Those which are of the masculine gender in the singular number,and neuter in the plural; as, hie tar tar us, lure tartara. 2 Thosewhich are masculine in the singular number, but masculine andneuter in the plural ; hie locus, hi loci, <)- lure loco. 3. Such asare feminine in the singular number, but neuter in the plural; as,hicc ceirbeisus, luce carhasa. 4. Such as are neuter in the sin-gular number, but masculine in the plural; as, hoc cerium, hi ca’li.5. Such as are neuter in the singular, but neuter and masculine inthe plural; as, hoc rastrum, Id reistri, cY lure rostra. And 6.Such as are neuter in the singular, but feminine in the plural; as,hoc cpulum, her epuler.

Heterogeneous Numbers, are mixed numbers, consisting ofintegers anil fractions.

Heterogeneous Particles, are such as are of different kindsof natures and qualities. Most bodies consist of such particles.

Heterogeneous Quantities, are those which are of suchdifferent kinds and considerations, as that one of them, taken anynumber of times, never equals or exceeds the other.

Heterogeneous Suros, are such as have different radicalsigns ; as, \/eia, and \/hh ; h/9, and \/ 19. See Ai.g ebra.

HETEROSCIANS, or IIETEROSCI1, [»njjf, and o-xia,] ailthe inhabitants of the globe between the tropics and polar c ircle,or without the torrid zone, are Ileteroscii, i. e. in N. latitude theirshadows at noon are always to the northward, and in the S. lati-tude to the southward. The inhabitants in these two situationsare Heteroscii to each other, having their shallows projected con-trary wavs at all times of the year.

IiETlI, [nn, lleb. i, e. fear,] the second son of Canaan, grand-eon of Ham, and progenitor of the Hittites , (Gen. x. 15.) He

dwelt southward of the promised land, at Hebron, or its neigh-bourhood. ■ Kpliron, an inhabitant of IL-bron, was a descendantof lieth, and the city in Abraham ’s time was pfcopled by his pos-terity. See IhxTirRS.

HEUCIiERA, in botany, a genus of the pcntanilria iligyniacla-s ami order. Natural order, Succulents -. Petals five; capsuletwo-beaked, two-celled. There are two species, viz. II. Ameri-cana, American heuchera, or sanicle, and H. dichotcma.

11EVELIUS , or IIEY F.LK.E, John, an eninent astronomer,born at Dantzic in the year Kill. He studied at Germany , Eng-land, and France , and every where obtained the esteem’of thelearned. He was the tirst who discovered a lihration in the moon,and made several important observation' on the other planets. Healso discovered several fixed stars, which lie named the firmament'of rfobieski in honour of John III, kir.g of Poland . His wile wasalso well skilled in astronomy, anil mane a part of the observationspublished by her husband. In lb73 lie published a description ofthe ilist™incuts with which lie made his observations, under thetitle of Machina Codestis: ami in 1679 lie published the secondpart of this work. Rut in Sept. 1679, while he was in the country,Ins house at Dantzic was burnt dow n, by which he lost several thou-sand pounds; having not only his observatory and ail his valuableinstruments destroyed, but also a great number of copies of liisMachina Ccelestis, which made his second part very scarce. Hedied in 1687, aged 76. In 1690 were published, his Finnamen-luni Sobiscianum, and Prodromes Astronomiaj & nova: Tabula:Solares, tina cum Catalogo Stellarum Fixarum, in which lie givesthe necessary preliminaries for taking an exact catalogue of thestars, lie was-greatly esteemed hy his countrymen, not only onaccount of his skill in astronomy, betas a very worthy magistrate.He was made a burgo-marter of Dantzic ; winch office he is saidto executed with the utmost integrity anil applause. He was alsohighly esteemed by foreign literati as well as by foreign princes-and potentates; as appears from a collection of their letters, printedat Dantzic in 1683.

11EY ER, a town of France , in the department of the Dyie,and late Austrian P.rabant, two miles S. of Louvain .

IiEUiv ELUM, a town of Batavia, in the department of Delft ,and late province of Holland , seated on the Ligne, five miles fromGorcum .

11EUSDEN, a strong town of Batavia, in the department ofDommcl and Scheldt, and late province of Holland , seated onthe Maese, eight miles N. W. of Bois-le-duc .

HEXAGON, [if and yom«,] a figure of six sides or angles:the most capacious of all the ligures that can be added to eachother without any interstice. The cells in honeycombs are of thatform.

Hexagon, Regular, in geometry, a figure whereof the sixsides and angles are equal. See Geometry, and Mensuration .

HEXAGYNIA, [Irom if, six, and yuv>i, a female,] an order ofplants in the class polyandria, containing such as have six styles.See Botany .

HEXAHEDRON, [if and %«,] in geometry, one of the fivePlatonic bodies, or regular solids, being the same with a cube.

11 EXAM ETER, [if and /ziT^of,] a verse of six feet. The firstfour feet may be either spondees or dactyls; the fifth is generallya dactyl, anil the sixth always a spondee. Such is the followingverse of Horace:

1 9 3 4 5_ ' 6

Aut pro I dessii vo I Hint, aut I delec | tarS pb I etae.

II EXAM I LI, II EXAM I LION, or HEXAMILIUM, a ce-lebrated wall, built by the emperor Emanuel in 1413, over theisthmus of Corinth. It took its name from if six, andwhich in the vulgar Greek signifies a mile, being six miles long.The design of it was to defend Peloponnesus from the incursionsof the barbarians.

HEXANDRIA, [from if six, and ai n c, a man,] in botany, thesixth class in Linnams’s sexual method, consisting of plants withhermaphrodite flowers, furnished with six stamina of an equallength. See Botany . ‘

H EXAI’LA, [from if, six, andowxaw, I unfold,] inchurch-historv,a Bible disposed in six columns; containing the text, anil diversversions thereof, compiled and published by Origen, with a viewof securing the sacred text from future corruptions, and to correctthose that had been already introduced. Eusebius , (Hist. Eccl.

6 lib.